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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This is one of many reasons I set up a backup at my parents’ place. Was an extra $200 or so but my most valuable data is backed up there also.
I also have my favorite photos printed every year.