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I have to use an external storage for a lot of my Nextcloud data because my server doesn't have enough storage.
What is a good backup strategy for this since the volume is not included into the cloudron backup?
You have to back it up somehow. Maybe, rsync the files using a cron job inside nextcloud - https://docs.cloudron.io/apps/#cron
Yes, technically, this is rather easy, but I am looking for best practices of other users if someone else has that scenario, e.g. where to sync it to as well.