diff --git a/.golangci.yml b/.golangci.yml
index 4371728..e1f39f5 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -136,6 +136,11 @@ linters:
           disabled: true
         - name: unused-parameter
         - name: unused-receiver
+    staticcheck:
+      checks:
+        - "all"
+        - "-SA9003"
+
 
   exclusions:
     presets:
diff --git a/.idx/dev.nix b/.idx/dev.nix
index 7389577..9b796d3 100644
--- a/.idx/dev.nix
+++ b/.idx/dev.nix
@@ -14,6 +14,7 @@
     fzf
     util-linux
     go
+    golangci-lint
     uv
     dos2unix
   ];
diff --git a/cmd/ai/pytorch.go b/cmd/ai/pytorch.go
index f7bea5f..66ae22c 100644
--- a/cmd/ai/pytorch.go
+++ b/cmd/ai/pytorch.go
@@ -22,10 +22,8 @@ func pytorch(cmd *cobra.Command, _ []string) {
 		utils.RunCmd(command)
 	}
 	if utils.GetBoolFlag(cmd, "config") {
-		// nothing to configure
 	}
 	if utils.GetBoolFlag(cmd, "uninstall") {
-		// TODO
 	}
 }
 
diff --git a/cmd/bigdata/arrowdb.go b/cmd/bigdata/arrowdb.go
index 1654eb1..942f98a 100644
--- a/cmd/bigdata/arrowdb.go
+++ b/cmd/bigdata/arrowdb.go
@@ -13,10 +13,7 @@ func linkArrowDbProfileFromHost() {
 	dstProfile := filepath.Join(utils.UserHomeDir(), ".arrowdb_profile")
 	if utils.ExistsFile(srcProfile) {
 		// inside a Docker container, link profile from host
-		if utils.ExistsFile(dstProfile) {
-			utils.RemoveAll(dstProfile)
-		}
-		utils.Symlink(srcProfile, dstProfile)
+		utils.Symlink(srcProfile, dstProfile, false)
 	}
 }
 
diff --git a/cmd/data.go b/cmd/data.go
index a1f349d..663d5d2 100644
--- a/cmd/data.go
+++ b/cmd/data.go
@@ -8,14 +8,14 @@ import (
 )
 
 // Pull data for icon from GitHub into ~/.config/icon-data.
-func data(cmd *cobra.Command, args []string) {
+func data(cmd *cobra.Command, _ []string) {
 	dir := "~/.config/icon-data"
 	if !utils.GetBoolFlag(cmd, "force") && utils.ExistsDir(dir+"/.git") {
 		fmt.Println("Using existing data in ~/.config/icon-data.")
 		return
 	}
 
-	utils.BackupDir(dir, "")
+	utils.Backup(dir, "")
 	utils.MkdirAll(dir, 0o700)
 
 	command := utils.Format(`git clone {gitUrl} {dir} \
diff --git a/cmd/dev/git.go b/cmd/dev/git.go
index 6c18e6c..d542195 100644
--- a/cmd/dev/git.go
+++ b/cmd/dev/git.go
@@ -36,7 +36,7 @@ func installGitUi(cmd *cobra.Command) {
 }
 
 func linkGitUiFiles(baseDir string) {
-	utils.SymlinkIntoDir("~/.config/icon-data/git/gitui/key_bindings.ron", filepath.Join(baseDir, "gitui"))
+	utils.SymlinkIntoDir("~/.config/icon-data/git/gitui/key_bindings.ron", filepath.Join(baseDir, "gitui"), true)
 }
 
 func configGitUi(cmd *cobra.Command) {
@@ -124,7 +124,7 @@ func git(cmd *cobra.Command, args []string) {
 	}
 	if utils.GetBoolFlag(cmd, "config") {
 		network.SshClient(cmd, args)
-		utils.Symlink("~/.config/icon-data/git/gitconfig", "~/.gitconfig")
+		utils.Symlink("~/.config/icon-data/git/gitconfig", "~/.gitconfig", true)
 		configGitProxy(cmd)
 		configGitUi(cmd)
 	}
diff --git a/cmd/dev/golang.go b/cmd/dev/golang.go
index e34e7cb..4f5e34c 100644
--- a/cmd/dev/golang.go
+++ b/cmd/dev/golang.go
@@ -60,7 +60,7 @@ func installGoPls(prefix string) {
 }
 
 // Install and configure Golang.
-func golang(cmd *cobra.Command, args []string) {
+func golang(cmd *cobra.Command, _ []string) {
 	prefix := utils.GetCommandPrefix(false, map[string]uint32{
 		"/usr/local/go":  unix.W_OK | unix.R_OK,
 		"/usr/local":     unix.W_OK | unix.R_OK,
diff --git a/cmd/dev/pytype.go b/cmd/dev/pytype.go
index 8ce9af2..f657256 100644
--- a/cmd/dev/pytype.go
+++ b/cmd/dev/pytype.go
@@ -11,7 +11,7 @@ import (
 )
 
 // Install and configure pytype.
-func pytype(cmd *cobra.Command, args []string) {
+func pytype(cmd *cobra.Command, _ []string) {
 	if utils.GetBoolFlag(cmd, "install") {
 		command := utils.Format("{pip_install} pytype", map[string]string{
 			"pip_install": utils.BuildPipInstall(cmd),
diff --git a/cmd/dev/rust.go b/cmd/dev/rust.go
index d471760..c0ab50e 100644
--- a/cmd/dev/rust.go
+++ b/cmd/dev/rust.go
@@ -104,7 +104,7 @@ func installCargoBinstall() {
 }
 
 // Install and configure Rust.
-func rust(cmd *cobra.Command, args []string) {
+func rust(cmd *cobra.Command, _ []string) {
 	rustupHome := utils.GetStringFlag(cmd, "rustup-home")
 	if rustupHome == "" {
 		rustupHome = filepath.Join(utils.UserHomeDir(), ".rustup")
diff --git a/cmd/ide/neovim.go b/cmd/ide/neovim.go
index b8d3820..9d8150f 100644
--- a/cmd/ide/neovim.go
+++ b/cmd/ide/neovim.go
@@ -8,7 +8,7 @@ import (
 )
 
 // Install and configure neovim.
-func neovim(cmd *cobra.Command, args []string) {
+func neovim(cmd *cobra.Command, _ []string) {
 	Neovim(
 		utils.GetBoolFlag(cmd, "install"),
 		utils.GetBoolFlag(cmd, "config"),
@@ -58,8 +58,7 @@ func Neovim(install bool, config bool, uninstall bool, yes_s string) {
 	}
 	if config {
 		dir := "~/.config/nvim"
-		utils.BackupDir(dir, "")
-		utils.Symlink("~/.config/icon-data/nvim", dir)
+		utils.Symlink("~/.config/icon-data/nvim", dir, true)
 	}
 	if uninstall {
 		switch runtime.GOOS {
diff --git a/cmd/ide/vscode.go b/cmd/ide/vscode.go
index c723550..01798b2 100644
--- a/cmd/ide/vscode.go
+++ b/cmd/ide/vscode.go
@@ -9,7 +9,7 @@ import (
 )
 
 // Install and configure Visual Studio Code.
-func vscode(cmd *cobra.Command, args []string) {
+func vscode(cmd *cobra.Command, _ []string) {
 	if utils.GetBoolFlag(cmd, "install") {
 		switch runtime.GOOS {
 		case "linux":
@@ -52,7 +52,7 @@ func vscode(cmd *cobra.Command, args []string) {
 		if utils.GetBoolFlag(cmd, "copy") {
 			utils.CopyFileToDir("~/.config/icon-data/vscode/settings.json", userDir)
 		} else {
-			utils.SymlinkIntoDir("~/.config/icon-data/vscode/settings.json", userDir)
+			utils.SymlinkIntoDir("~/.config/icon-data/vscode/settings.json", userDir, true)
 		}
 	}
 	if utils.GetBoolFlag(cmd, "uninstall") {
diff --git a/cmd/jupyter/ganymede.go b/cmd/jupyter/ganymede.go
index c831f2e..71e0bb2 100644
--- a/cmd/jupyter/ganymede.go
+++ b/cmd/jupyter/ganymede.go
@@ -11,7 +11,7 @@ import (
 )
 
 // Install and configure Ganymede.
-func ganymede(cmd *cobra.Command, args []string) {
+func ganymede(cmd *cobra.Command, _ []string) {
 	if utils.GetBoolFlag(cmd, "install") {
 		tmpdir := utils.CreateTempDir("")
 		defer os.RemoveAll(tmpdir)
diff --git a/cmd/jupyter/ipython.go b/cmd/jupyter/ipython.go
index e49e8c3..c417daa 100644
--- a/cmd/jupyter/ipython.go
+++ b/cmd/jupyter/ipython.go
@@ -8,7 +8,7 @@ import (
 )
 
 // Install and configure IPython.
-func ipython(cmd *cobra.Command, args []string) {
+func ipython(cmd *cobra.Command, _ []string) {
 	if utils.GetBoolFlag(cmd, "install") {
 		command := utils.Format("{prefix} {pip_install} ipython", map[string]string{
 			"prefix": utils.GetCommandPrefix(
@@ -24,10 +24,10 @@ func ipython(cmd *cobra.Command, args []string) {
 		profile_default := filepath.Join(profile_dir, "profile_default")
 		utils.Symlink(
 			"~/.config/icon-data/ipython/startup.ipy",
-			filepath.Join(profile_default, "startup/startup.ipy"))
+			filepath.Join(profile_default, "startup/startup.ipy"), true)
 		utils.SymlinkIntoDir(
 			"~/.config/icon-data/ipython/ipython_config.py",
-			profile_default)
+			profile_default, true)
 	}
 	if utils.GetBoolFlag(cmd, "uninstall") {
 		command := utils.Format("{prefix} {pip_uninstall} ipython", map[string]string{
diff --git a/cmd/jupyter/jupyter_book.go b/cmd/jupyter/jupyter_book.go
index f664724..bf7d95f 100644
--- a/cmd/jupyter/jupyter_book.go
+++ b/cmd/jupyter/jupyter_book.go
@@ -8,7 +8,7 @@ import (
 )
 
 // Install and configure jupyter_book.
-func jupyter_book(cmd *cobra.Command, args []string) {
+func jupyter_book(cmd *cobra.Command, _ []string) {
 	if utils.GetBoolFlag(cmd, "install") {
 		command := utils.Format("{pip_install} jupyter-book", map[string]string{
 			"pip_install": utils.BuildPipInstall(cmd),
diff --git a/cmd/jupyter/jupyterlab_vim.go b/cmd/jupyter/jupyterlab_vim.go
index 7fe615f..9e02446 100644
--- a/cmd/jupyter/jupyterlab_vim.go
+++ b/cmd/jupyter/jupyterlab_vim.go
@@ -6,7 +6,7 @@ import (
 )
 
 // Install and configure the jupyterlab_vim extension for JupyterLab.
-func jupyterlab_vim(cmd *cobra.Command, args []string) {
+func jupyterlab_vim(cmd *cobra.Command, _ []string) {
 	prefix := utils.GetCommandPrefix(
 		utils.GetBoolFlag(cmd, "sudo"),
 		map[string]uint32{},
diff --git a/cmd/network/github.go b/cmd/network/github.go
index b8a6c5d..04c608c 100644
--- a/cmd/network/github.go
+++ b/cmd/network/github.go
@@ -83,7 +83,7 @@ func GetLatestRelease(releaseUrl string) ReleaseInfo {
 // Download a release from GitHub.
 // @param args: The arguments to parse.
 // If None, the arguments from command-line are parsed.
-func DownloadGitHubReleaseArgs(cmd *cobra.Command, args []string) {
+func DownloadGitHubReleaseArgs(cmd *cobra.Command, _ []string) {
 	DownloadGitHubRelease(
 		utils.GetStringFlag(cmd, "repo"),
 		utils.GetStringFlag(cmd, "version"),
diff --git a/cmd/network/ssh_client.go b/cmd/network/ssh_client.go
index be3d947..8d09aa6 100644
--- a/cmd/network/ssh_client.go
+++ b/cmd/network/ssh_client.go
@@ -34,11 +34,11 @@ func adjustPathInConfig() {
 }
 
 // Install and configure SSH client.
-func SshClient(cmd *cobra.Command, args []string) {
+func SshClient(cmd *cobra.Command, _ []string) {
 	if utils.GetBoolFlag(cmd, "install") {
 	}
 	if utils.GetBoolFlag(cmd, "config") {
-		utils.SymlinkIntoDir("~/.config/icon-data/ssh/client/config", sshHome)
+		utils.SymlinkIntoDir("~/.config/icon-data/ssh/client/config", sshHome, true)
 		copySshcSettingsFromHost()
 		utils.MkdirAll(filepath.Join(sshHome, "control"), 0o700)
 		/*
diff --git a/cmd/network/ssh_server.go b/cmd/network/ssh_server.go
index 5267b30..0e2969f 100644
--- a/cmd/network/ssh_server.go
+++ b/cmd/network/ssh_server.go
@@ -6,7 +6,7 @@ import (
 )
 
 // Install and configure SSH server.
-func SshServer(cmd *cobra.Command, args []string) {
+func SshServer(cmd *cobra.Command, _ []string) {
 	if utils.GetBoolFlag(cmd, "install") {
 		if utils.IsDebianUbuntuSeries() {
 			command := utils.Format("{prefix} apt-get update && {prefix} apt-get install {yes_s} openssh-server fail2ban", map[string]string{
diff --git a/cmd/shell/alacritty.go b/cmd/shell/alacritty.go
index b4a48ff..3858733 100644
--- a/cmd/shell/alacritty.go
+++ b/cmd/shell/alacritty.go
@@ -8,7 +8,7 @@ import (
 )
 
 // Install and configure the Alacritty terminal.
-func alacritty(cmd *cobra.Command, args []string) {
+func alacritty(cmd *cobra.Command, _ []string) {
 	if utils.GetBoolFlag(cmd, "install") {
 		switch runtime.GOOS {
 		case "linux":
diff --git a/cmd/shell/atuin.go b/cmd/shell/atuin.go
index 5902649..1c24280 100644
--- a/cmd/shell/atuin.go
+++ b/cmd/shell/atuin.go
@@ -9,7 +9,7 @@ import (
 )
 
 // Install atuin.
-func atuin(cmd *cobra.Command, args []string) {
+func atuin(cmd *cobra.Command, _ []string) {
 	if utils.GetBoolFlag(cmd, "install") {
 		command := "bash <(curl https://raw.githubusercontent.com/ellie/atuin/main/install.sh)"
 		utils.RunCmd(command)
diff --git a/cmd/shell/bash_it.go b/cmd/shell/bash_it.go
index c0b2199..343223c 100644
--- a/cmd/shell/bash_it.go
+++ b/cmd/shell/bash_it.go
@@ -9,7 +9,7 @@ import (
 
 // Install bash-it, a community Bash framework.
 // For more details, please refer to https://github.com/Bash-it/bash-it#installation.
-func bashIt(cmd *cobra.Command, args []string) {
+func bashIt(cmd *cobra.Command, _ []string) {
 	home := utils.UserHomeDir()
 	if utils.GetBoolFlag(cmd, "install") {
 		dir := filepath.Join(home, ".bash_it")
@@ -23,7 +23,7 @@ func bashIt(cmd *cobra.Command, args []string) {
 	}
 	if utils.GetBoolFlag(cmd, "config") {
 		utils.ConfigBash()
-		utils.Symlink("~/.config/icon-data/bash-it", "~/.bash_it")
+		utils.Symlink("~/.config/icon-data/bash-it", "~/.bash_it", true)
 	}
 	if utils.GetBoolFlag(cmd, "uninstall") {
 		utils.RunCmd("~/.bash_it/uninstall.sh && rm -rf ~/.bash_it/")
diff --git a/cmd/shell/fish.go b/cmd/shell/fish.go
index 7dfdf1a..78b2602 100644
--- a/cmd/shell/fish.go
+++ b/cmd/shell/fish.go
@@ -75,7 +75,7 @@ func generateCrazyCompletions() {
 }
 
 // Install and config the fish shell.
-func fish(cmd *cobra.Command, args []string) {
+func fish(cmd *cobra.Command, _ []string) {
 	if utils.GetBoolFlag(cmd, "install") {
 		switch runtime.GOOS {
 		case "linux":
@@ -92,8 +92,7 @@ func fish(cmd *cobra.Command, args []string) {
 	}
 	if utils.GetBoolFlag(cmd, "config") {
 		dir := "~/.config/fish"
-		utils.BackupDir(dir, "")
-		utils.Symlink("~/.config/icon-data/fish", dir)
+		utils.Symlink("~/.config/icon-data/fish", dir, true)
 
 		generateCompletions()
 		generateCrazyCompletions()
diff --git a/cmd/shell/hyper.go b/cmd/shell/hyper.go
index 3451366..85150fb 100644
--- a/cmd/shell/hyper.go
+++ b/cmd/shell/hyper.go
@@ -56,7 +56,7 @@ func hyper(cmd *cobra.Command, _ []string) {
 		log.Printf("Hyper plugins hypercwd, hyper-search, hyper-pane and hyperpower are installed.\n")
 		utils.Symlink(
 			"~/.config/icon-data/hyper/hyper.js",
-			"~/.hyper.js")
+			"~/.hyper.js", true)
 	}
 	if utils.GetBoolFlag(cmd, "uninstall") {
 		switch runtime.GOOS {
diff --git a/cmd/shell/zellij.go b/cmd/shell/zellij.go
index 1d951e9..0792ae6 100644
--- a/cmd/shell/zellij.go
+++ b/cmd/shell/zellij.go
@@ -11,7 +11,7 @@ import (
 )
 
 // Install and configure Ganymede.
-func zellij(cmd *cobra.Command, args []string) {
+func zellij(cmd *cobra.Command, _ []string) {
 	if utils.GetBoolFlag(cmd, "install") {
 		tmpdir := utils.CreateTempDir("")
 		defer os.RemoveAll(tmpdir)
@@ -34,7 +34,7 @@ func zellij(cmd *cobra.Command, args []string) {
 		utils.RunCmd(command)
 	}
 	if utils.GetBoolFlag(cmd, "config") {
-		utils.Symlink("~/.config/icon-data/zellij/config.kdl", "~/.config/zellij/config.kdl")
+		utils.Symlink("~/.config/icon-data/zellij/config.kdl", "~/.config/zellij/config.kdl", true)
 	}
 	if utils.GetBoolFlag(cmd, "uninstall") {
 	}
diff --git a/cmd/update.go b/cmd/update.go
index f28b031..6f2b30e 100644
--- a/cmd/update.go
+++ b/cmd/update.go
@@ -7,7 +7,7 @@ import (
 )
 
 // Update icon.
-func update(cmd *cobra.Command, args []string) {
+func update(cmd *cobra.Command, _ []string) {
 	dir := utils.GetStringFlag(cmd, "install-dir")
 	command := utils.Format(`curl -sSL https://raw.githubusercontent.com/legendu-net/icon/main/install_icon.sh \
 			| {prefix} bash -s -- -d {dir}`, map[string]string{
diff --git a/cmd/version.go b/cmd/version.go
index cacfea9..1b93055 100644
--- a/cmd/version.go
+++ b/cmd/version.go
@@ -7,8 +7,8 @@ import (
 )
 
 // Show the version of icon.
-func version(_ *cobra.Command, args []string) {
-	fmt.Println("0.31.2")
+func version(_ *cobra.Command, _ []string) {
+	fmt.Println("0.32.0")
 }
 
 var versionCmd = &cobra.Command{
diff --git a/utils/utils.go b/utils/utils.go
index 952729e..9596358 100644
--- a/utils/utils.go
+++ b/utils/utils.go
@@ -967,7 +967,7 @@ fi
 // @param paths: Absolute paths to add into PATH.
 // @param config_file: The path of a shell's configuration file.
 func ConfigShellPath(config_file string) {
-	if GetLinuxDistId() == "idx" {
+	if GetLinuxDistID() == "idx" {
 		return
 	}
 	text := ReadFileAsString(config_file)
@@ -1234,11 +1234,11 @@ func IsLinux() bool {
 //	if distId == "ubuntu" {
 //	  fmt.Println("Running on Ubuntu")
 //	}
-func GetLinuxDistId() string {
+func GetLinuxDistID() string {
 	m := distro.OSRelease()
-	distId, found := m["ID"]
+	distID, found := m["ID"]
 	if found {
-		return distId
+		return distID
 	}
 	return ""
 }
@@ -1259,7 +1259,7 @@ func GetLinuxDistId() string {
 //	  fmt.Println("Not running on Ubuntu")
 //	}
 func IsUbuntu() bool {
-	return GetLinuxDistId() == "ubuntu"
+	return GetLinuxDistID() == "ubuntu"
 }
 
 // IsDebian checks if the current Linux distribution is Debian.
@@ -1278,7 +1278,7 @@ func IsUbuntu() bool {
 //	  fmt.Println("Not running on Debian")
 //	}
 func IsDebian() bool {
-	return GetLinuxDistId() == "debian"
+	return GetLinuxDistID() == "debian"
 }
 
 // IsDebianSeries checks if the current Linux distribution belongs to the Debian series.
@@ -1303,9 +1303,9 @@ func IsDebianSeries() bool {
 		"antix",
 		"lmde",
 	}
-	distId := GetLinuxDistId()
+	distID := GetLinuxDistID()
 	for _, id := range ids {
-		if distId == id {
+		if distID == id {
 			return true
 		}
 	}
@@ -1339,9 +1339,9 @@ func IsDebianUbuntuSeries() bool {
 		"lmde",
 		"ubuntu", "linuxmint", "pop",
 	}
-	distId := GetLinuxDistId()
+	distID := GetLinuxDistID()
 	for _, id := range ids {
-		if distId == id {
+		if distID == id {
 			return true
 		}
 	}
@@ -1372,7 +1372,7 @@ func IsUbuntuSeries() bool {
 	ids := []string{
 		"ubuntu", "linuxmint", "pop",
 	}
-	distId := GetLinuxDistId()
+	distId := GetLinuxDistID()
 	for _, id := range ids {
 		if distId == id {
 			return true
@@ -1405,7 +1405,7 @@ func IsFedoraSeries() bool {
 	ids := []string{
 		"fedora", "centos", "rhel",
 	}
-	distId := GetLinuxDistId()
+	distId := GetLinuxDistID()
 	for _, id := range ids {
 		if distId == id {
 			return true
@@ -1501,9 +1501,15 @@ func IsSocket(path string) bool {
 // @example
 //
 //	Symlink("/path/to/source/file.txt", "/path/to/link/file.txt")
-func Symlink(path string, dstLink string) {
+func Symlink(path string, dstLink string, backup bool) {
 	path = NormalizePath(path)
 	dstLink = NormalizePath(dstLink)
+	if backup {
+		Backup(dstLink, "")
+	} else {
+		RemoveAll(dstLink)
+	}
+
 	MkdirAll(filepath.Dir(dstLink), 0o700)
 	err := os.Symlink(path, dstLink)
 	if err != nil {
@@ -1511,8 +1517,8 @@ func Symlink(path string, dstLink string) {
 	}
 }
 
-func SymlinkIntoDir(path string, dstDir string) {
-	Symlink(path, filepath.Join(dstDir, filepath.Base(path)))
+func SymlinkIntoDir(path string, dstDir string, backup bool) {
+	Symlink(path, filepath.Join(dstDir, filepath.Base(path)), backup)
 }
 
 // Update map1 using map2.
@@ -1555,11 +1561,11 @@ func UpdateMap(map1 orderedmap.OrderedMap[string, any], map2 orderedmap.OrderedM
 			map1.Set(key2, val2)
 			continue
 		}
-		switch val2.(type) {
+		switch t2 := val2.(type) {
 		case orderedmap.OrderedMap[string, any]:
-			switch val1.(type) {
+			switch t1 := val1.(type) {
 			case orderedmap.OrderedMap[string, any]:
-				UpdateMap(val1.(orderedmap.OrderedMap[string, any]), val2.(orderedmap.OrderedMap[string, any]))
+				UpdateMap(t1, t2)
 			default:
 				map1.Set(key2, val2)
 			}
@@ -1665,21 +1671,21 @@ func ParseInt(str string) int64 {
 	return i
 }
 
-func RenameDir(originalDir string, newDir string) {
-	err := os.Rename(originalDir, newDir)
+func Rename(original string, new string) {
+	err := os.Rename(original, new)
 	if err != nil {
 		log.Fatal(err)
 	}
 }
 
-func BackupDir(originalDir string, backupDir string) {
-	originalDir = NormalizePath(originalDir)
-	backupDir = NormalizePath(backupDir)
-	if ExistsDir(originalDir) {
-		if backupDir == "" {
-			backupDir = filepath.Clean(originalDir) + "_" + time.Now().Format(time.RFC3339)
+func Backup(original string, backup string) {
+	original = NormalizePath(original)
+	backup = NormalizePath(backup)
+	if ExistsDir(original) {
+		if backup == "" {
+			backup = filepath.Clean(original) + "_" + time.Now().Format(time.RFC3339)
 		}
-		RenameDir(originalDir, backupDir)
-		fmt.Printf("%s has been backed up to %s.\n", originalDir, backupDir)
+		Rename(original, backup)
+		fmt.Printf("%s has been backed up to %s.\n", original, backup)
 	}
 }