This error at least stems from the postgres service not running. Which version of Cloudron is this and if you ensure (maybe restart) the postgres service then trigger the backup, is that always reproducible?
@eddowding doesn't completely solve your issue as it's not about installing app, but perhaps Alex should just be an App Operator for specific apps?
https://docs.cloudron.io/apps/#operators
Restic: https://restic.net
Supported repos out of the box: https://restic.readthedocs.io/en/stable/030_preparing_a_new_repo.html
Other repos when combining restic with rclone: https://restic.readthedocs.io/en/stable/030_preparing_a_new_repo.html#other-services-via-rclone
A starting point: https://docs.cloudron.io/guides/community/restic-rclone/
@joseph ah, there you go. I have indeed updated to 24.04, and presumably it was before this instruction was added.
Thank you all for the help, guys, all is well now
Ah this is good information and indeed a likely a problem for rsync backups with a lot of files (not sure how the rate-limit turns out in the end though)