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    Jellyfin Forum Support Troubleshooting Database backup failing after fresh install

     
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    Database backup failing after fresh install

    Database backup fails with "System.FormatException: Guid string should only contain hexadecimal characters"
    BaconatorWithFries27
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    #1
    2026-02-17, 04:18 PM
    So here's the story: I'm trying to migrate to a new server running 10.11.6. My production server is still running 10.10.7 and that's working fine. The new 10.11.6 server was working fine for about a week as I was testing it, then the database became corrupted, I believe due to a power issue. Of course I hadn't gotten around to making a backup yet, so yesterday I tried some troubleshooting steps to recover it (shoutout MadGoatHaz on github for the script - it failed due to allegedly non-unique key entries). Eventually I gave up, completely reinstalled Jellyfin, and began rebuilding my library of almost 1,000 movies and about 100,000 TV episodes. I decided to leave my music library out for now to minimize the size of the database.

    Cut to this morning where it has found only half of the TV shows. I go to make a backup this morning and receive "an unknown error occurred" on the web UI. Checking the logs shows the error "System.FormatException: Guid string should only contain hexadecimal characters" when it begins backing up BaseItems. I'm not a database engineer so I'm lost and could use some advice. Should I just yeet this and start over again?

    Server is running on Ubuntu 24.04.4 running in a Proxmox container. Disk has just short of 300GB free.

    Thanks!
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