[bug]: Service backup backs up remote cifs mounts' contents

[gStart9]

Prerequisites

• I have searched for existing issues that already report this problem.

Server Hardware

Server Pure (x86_64)

StartOS Version

040b9

Client OS

Linux

Client OS Version

Debian 13

Browser

Firefox

Browser Version

150

Current Behavior

May be tangentally related to #3244

• With the Jellyfin service succesfully started, I mount a cifs share into StartOS at a path accessible to Jellyfin containing 22GB of audiobooks:
  mount -t cifs //laptop/audiobooks /media/startos/data/package-data/volumes/jellyfin/data/cache/AUDIOBOOKS -o username=user,password=password,uid=100000

• Add a media Audibook Library to Jellyfin in the setup wizard, referencing /cache/AUDIOBOOKS. For some reason, Jellyfin does not pick the media up:

2026-05-22T22:21:56+00:00 [22:21:56] [WRN] [110] MediaBrowser.Controller.Entities.BaseItem: Library folder /cache/AUDIOBOOKS is inaccessible or empty, skipping

• Make a backup of the Jellyfin service. It's successful!
  BUT - my StartOS backup folder on the CIFS share has grown by 22GB!
  Seems like it should not have picked up that CIFS share for backup, especially if Jellyfin itself can't read the data (although I would like Jellyfin to read the data of a remote share, and somebody else requested this recently too).

When i use start-cli package attach jellyfin, I can't see any contents of /cache/AUDIOBOOKS (the folder appears empty).

When I mount the remote cifs share into the filebrowser container, I can see it from a shell within the Jellyfin container, no problem:

# mount -t cifs //laptop/audiobooks /media/startos/data/package-data/volumes/filebrowser/data/data/AUDIOBOOKS -o username=user,password=password,uid=100000
# start-cli package attach jellyfin
root@ZCZDZ5XQ7XHBGWEVCHPY3SC2AO5JIUVQ:# df -h
Filesystem                                                                             Size  Used Avail Use% Mounted on
overlay                                                                                3.7T  2.0T  1.7T  54% /
/dev/mapper/EMBASSY_UTNPCSXJ2JEQ6MIXJP5F4ZYMLZTFAQPLBYPPJ5K4OFECG37LBKWQ_package-data  3.7T  2.0T  1.7T  54% /cache
//laptop/audiobooks                                                                    3.7T  1.2T  2.5T  32% /mnt/filebrowser/AUDIOBOOKS
none                                                                                   492K  4.0K  488K   1% /dev
udev                                                                                    16G     0   16G   0% /dev/tty
tmpfs                                                                                   16G     0   16G   0% /dev/shm
root@ZCZDZ5XQ7XHBGWEVCHPY3SC2AO5JIUVQ:/# ls -al /mnt/filebrowser/AUDIOBOOKS/
total 6210724
drwxr-xr-x 2 root nogroup          0 Apr 13 01:31  .
drwxr-xr-x 1 1000    1000        162 May 22 23:17  ..
drwxr-xr-x 2 root nogroup          0 Mar  9 03:27 'David Graeber & David Wengrow - The Dawn of Everything Audiobook'
-rwxr-xr-x 1 root nogroup       1414 Mar 13 04:07  m4b_to_mp3_chapters.sh
drwxr-xr-x 2 root nogroup          0 Feb 20 18:39 'Psychological Types-The Psychology of Individuation'
drwxr-xr-x 2 root nogroup          0 Mar  3 04:36 'Robert Hastings - UFOs Nukes, Second Edition'
-rwxr-xr-x 1 root nogroup  433623526 Apr 13 01:36 'The Dark Net - Inside the Digital Underworld.m4b'
-rwxr-xr-x 1 root nogroup  692276875 Mar  8 21:07 'The Dawn of Everything - A New History of Humanity by David Graeber and David Wengrow  Audiobook 2021.mp3'
drwxr-xr-x 2 root nogroup          0 Mar 13 04:09 'The Man Who Mastered Gravity [2023]'

Jellyfin the application can see no audiobooks in either folder!

Expected Behavior

I would like to be able to mount remote cifs shares into startOS directories and then have the containerized services be able to read them.

But mostly I expect the service backup process to not backup the contents of a remotely mounted directory.

Steps to Reproduce

1. Start Jellyfin (when it's pointed at filebrowser)
2. Mount A remote cifs share onto startos, under a directory in FileBrowser:
   sudo mount -t cifs //laptop/audiobooks /media/startos/data/package-data/volumes/filebrowser/data/data/AUDIOBOOKS -o username=user,password=password,uid=100000
3. Backup Jellyfin
4. The backup contains the data from the remotely mounted CIFS share

Anything else?

No response