I recently decided to replace the SD card in my Raspberry Pi and reinstall the system. Without any special backups in place, I turned to rsync to duplicate /var/lib/docker with all my containers, including Nextcloud.
Step #1: I mounted an external hard drive to /mnt/temp.
Step #2: I used rsync to copy the data to /mnt/tmp. See the difference?
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I’m just impressed an SD card in a Pi lasted since 2017 without losing all your data on its own.
For the future the general guideline is 3 copies of your data at minimum, so definitely set up some backups.
How do you actually do that?
Lots of backup software out there, I use a mix of Veeam Endpoint, Restic w/ Backblaze B2, and iDrive.