I've been using rsync and cron as a backup for like... 20+ years? Always had n+1 hard disks, with one accessed read only by a script that writes a copy to another drive once a day. I've got files from circa-2000 still floating around so the system has been working...

But figured it was time for a deduplicating setup since my data is blowing out a bit. After some trial and error have opted for Duplicacy. Back up running on my home server, and pushing the chunks to my work server (read: server at my workshop as opposed to "work server" as such). Went with a 20:2 erasure coding for that par2-esque bitrot protection.

Somewhat worried since using a program to maintain archives means you rely on that program existing 5ever, and not corrupting anything.... but I figure unraid with 2 parity drives is pretty resilient in terms of hardware failure, and I'm already using Crashplan for remote backups so I've got a fallback.