Another option is to use Image File Utilities on the Pi to create an image backup. You can use cron + a bash script to create incremental backups using the tool (e.g., take a ‘fresh’ backup each month, with daily incremental backups in between). I mount a network ‘backup’ drive (a local NAS, but you could use anything) to save the image to so I can actually access it. Then, just use balena etcher to flash the backup iso in the event of a failure.
Thanks for this, I have a similar setup and looking to migrate from Kavita -> Komga + iPad reader. For Paperback, does syncing read progress actually work to/from Komga? In the Komga instructions for syncing it directs me to install a custom Paperback tracker that only works for v.0.7 (and Paperback is currently v.0.8).