docs: 补充文档

README.en_US.md

@@ -89,8 +89,27 @@ name = Git
 ; Directories or files to be synchronized, concatenated from $HOME
 [configuration_files]
 .gitconfig_work
+
+; XDG configuration file, concatenated from $XDG_CONFIG_HOME
+; see: https://specifications.freedesktop.org/basedir-spec/latest
+[xdg_configuration_files]
+git/config
 ```
 
+## Advanced
+
+### Forced Restore
+
+When using `backup-cli -r` to restore backups, the `--force` option does not bypass confirmation prompts even when set to force overwriting files. This is due to security and data integrity considerations; by default, backups are not overwritten without user consent.
+
+- **Tip**: You can enforce a restore operation by setting the environment variable `BACKUP_FORCE_RESTORE = true`. However, it's important to note that this still requires using the `--force` argument in your command.
+
+### Restoring Another's Backup
+
+When attempting to restore files from backup directories into your `$HOME` directory, the issue might arise because their `$HOME` directories may differ from yours. Direct restoration would fail due to these differences.
+
+- **Tip**: To successfully restore another person's backups, you can set the environment variable `BACKUP_UPSTREAM_HOME={theirs HOME directory}` in your command. This specifies where each file should be placed upon restoration, ensuring they are correctly located on your system.
+
 ## Who is Using
 
 - [Wxh16144's Dotfiles](https://github.com/Wxh16144/dotfiles)

README.md

@@ -89,8 +89,27 @@ name = Git
 ; 要同步的目录或文件， 从 $HOME 开始拼接
 [configuration_files]
 .gitconfig_work
+
+; XDG 配置文件, 从 $XDG_CONFIG_HOME 开始拼接;
+; see: https://specifications.freedesktop.org/basedir-spec/latest
+[xdg_configuration_files]
+git/config
 ```
 
+## 高级用法
+
+### 强制还原
+
+`backup-cli -r` 还原备份时使用 `--force` 无法强制覆盖文件（还是会进行二次确认）。因为数据是宝贵的，所以默认不会覆盖。
+
+- **tips**: 你可以通过设置 `BACKUP_FORCE_RESTORE = true` 环境变量来强制还原。（还是需要加上 `--force` 参数）
+
+### 还原他人的备份
+
+还原备份目录中的文件到 `$HOME` 目录，但是他人的 `$HOME` 目录可能和你的不一样，所以不能直接还原。
+
+- **tips**: 你可以通过设置 `BACKUP_UPSTREAM_HOME={别人的HOME目录}` 环境变量来还原他人的备份。
+
 ## 谁在使用
 
 - [Wxh16144's Dotfiles](https://github.com/Wxh16144/dotfiles)