Why we get cascading backup folders?

[CoSoCo]

As you can see in the attached screen shots, we get such backup folders. Why?

Also we get weird file names. (but this maybe a fault of the unexperienced user):

Additionally the empty folders are not deletable:

praxis@T540p:~$ curl --version
curl 8.14.1 (x86_64-pc-linux-gnu) libcurl/8.14.1 OpenSSL/3.0.13 zlib/1.3 brotli/1.1.0 libpsl/0.21.2 nghttp2/1.59.0
Release-Date: 2025-06-04
Protocols: dict file ftp ftps gopher gophers http https imap imaps ipfs ipns mqtt pop3 pop3s rtsp smb smbs smtp smtps telnet tftp ws wss
Features: alt-svc AsynchDNS brotli HSTS HTTP2 HTTPS-proxy IPv6 Largefile libz NTLM PSL SSL threadsafe TLS-SRP UnixSockets

praxis@T540p:~$ apt policy libcurl4t64
libcurl4t64:
  Installiert:           8.5.0-2ubuntu10.6
  Installationskandidat: 8.5.0-2ubuntu10.6
  Versionstabelle:
 *** 8.5.0-2ubuntu10.6 500
        500 http://de.archive.ubuntu.com/ubuntu noble-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu noble-security/main amd64 Packages
        100 /var/lib/dpkg/status
     8.5.0-2ubuntu10 500
        500 http://de.archive.ubuntu.com/ubuntu noble/main amd64 Packages

praxis@T540p:~$ apt policy onedrive
onedrive:
  Installiert:           2.5.6-1+np1+1.1
  Installationskandidat: 2.5.6-1+np1+1.1
  Versionstabelle:
 *** 2.5.6-1+np1+1.1 500
        500 https://download.opensuse.org/repositories/home:/npreining:/debian-ubuntu-onedrive/xUbuntu_24.04 ./ Packages
        100 /var/lib/dpkg/status
     2.4.25-1build5 500
        500 http://de.archive.ubuntu.com/ubuntu noble/universe amd64 Packages

[abraunegg]

@CoSoCo

As you can see in the attached screen shots, we get such backup folders. Why?

Potentially this is a bug, as folders should not be created in a safeBackup situation.

Please follow the correct support process to diagnose:

1. Build client manually from 'master'
2. Attempt to replicate the issue
3. If the issue can be replicated, create a bug report and provide all relevant details including a verbose log that demonstrates the issue. A debug log is also required, and this must be provided via email.

[CoSoCo]

Potentially this is a bug, as folders should not be created in a safeBackup situation.

I thought, it could have been that experience already existed with this issue.

The problem is, that I can not really see, what the user is doing during weeks, so difficult to replicate ... and the machine is productive at a medical doctor.
So I will still observe the next time.

Please follow the correct support process to diagnose:

I only have remote access to the machine and it's used productive, so it would be risky to experiment with manual builds.