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Is your feature request related to a problem? Please describe.
This is a feature request and a problem, as data intergrity and backup are very important in todays IT landscape.

Describe the solution you'd like
I would like to have clear instructions, what files do you need to backup, what commands have to be ran so that DB is backed up correctly and lastly, what commands you have to run and in what order to restore from that backup.

Describe alternatives you've considered
I am currently trying to implement restic backups of my nextcloud instance.
The NCDATA and NCBACKUP folders are self explanatory, and those are easy to integrate to a cron script.
But currently there are no docs or guides on how you backup and restore rest of nextcloud VM.

Additional context
This guide uses https://github.com/dombyte/Restic-Nextcloud/blob/main/ncbackup.sh mysql dump, but nextcloud VM use PGSQL, which doesnt work with that.
It is unclear if you have to set the server to maintenneance mode before you make a SQL snapshot.