Unable to view restored files

[PapayaPlant]

Describe the issue:
I am unable to view the restored files via the host system one I restore a backed up repo. I am new to Linux and Self-Hosting, so I am sorry if I've missed something very obvious, but ran into this problem when try to test my back-up and restore process.

Posting here, as I'm sure this is not a bug and more user error.

To Reproduce

• Backrest is running on my Mini PC via docker compose (debian 12)
• Backrest has a repository on an external USB SSD connected to the Mini-PC (will also setup a cloud backup when Ive got this worked out)
• Backrest then has a path to the data from my NAS and pulls only the image/video data from Immich (stops and starts the container)

This all works well & the backup completes. I can see the 10GiB size of my Immich library backed up.

Where my problems come up is my restore location.

• I am trying to restore to an NVME SSD in my mini-PC (not the one running the OS), the folder has root permissions on this SSD, and container is running as root.
• The OS can write to it as I'm using this as a cache-ssd for immich anyway & it's in my fstab.
• Logs, no errors, just it running the operation to restore my immich data to the cache-ssd and the test folder I made.

When I run the restore to the location, it appears to complete but when I go to check in that directory, nothing.

I can download the snapshot through the backrest UI and extract the files and view the images no problem...but where has the data gone? Why can't I see it via my SSH terminal when I 'ls' that directory?

I open a shell container for backrest and run:

du -h -d 1 /

I can see data gets put in the mnt directory, as it's now around 10GiB larger (my cache-ssd is under mnt/cache-ssd), but I still can't see it. So I stop the container, remove it and start again. This time the data is now gone.

I originally thought this could be a permissions issues, so I made sure to have root permissions on the folder location. I then also added it as a volume to the docker compose, still no luck.

I used a bit of ChatGPT to try and help as I could not find much elsewhere online, it suggested I run this:

du -h -d 2 /mnt/cache-ssd/backrest-restore | sort -h | tail -20

This is now the first time I've seen the data (it then showed the contents of the folder for all the years of immich data I have)

10.4G /mnt/cache-ssd/backrest-restore/userdata

ChatGPT seems to think that I see nothing because the restored files only exist inside the container’s private mount layer. Even if I try to change the permissions to my user with a chmod, it still does not seem to work.

Expected behavior
Once a back-up completes, be able to view the data.

It could very well be I am misunderstanding something here, is this just how it should be working? For a restore I then just download the data to my location laptop and then copy it back to the directories it needs to be in?

Docker Compose:

version: "3.2"
services:
  backrest:
    image: garethgeorge/backrest:latest
    container_name: backrest
    hostname: backrest
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock:ro
      - ./backrest/data:/data
      - ./backrest/config:/config
      - ./backrest/cache:/cache
      - /mnt/immich/admin:/userdata #This is my immich image and video data folder 
      - /mnt/backup/immich:/repos #This is my backup location for immich
      - /mnt/cache-ssd/backrest-restore:/restore
    environment:
      - BACKREST_DATA=/data # path for backrest data. restic binary and the database are placed here.
      - BACKREST_CONFIG=/config/config.json # path for the backrest config file.
      - XDG_CACHE_HOME=/cache # path for the restic cache which greatly improves performance.
      - TZ=Europe/London # set the timezone for the container, used as the timezone for cron jobs.
    restart: unless-stopped
    ports:
      - 9898:9898

Platform Info

• Beelink EQi12 (i5 12450H), Debain 12.12 Bookworm with a Sandisk 2TB USB SSD attached & a WD RED SN700 500GB NVME SSD
• UGreen 4800 Plus NAS (4x 8tb Ironwolf drives)
• Backrest Version 1.10.1