I’ve used rclone with backblaze B2 very successfully. rclone is easy to configure and can encrypt everything locally before uploading, and B2 is dirt cheap and has retention policies so I can easily manage (per storage pool) how long deleted/changed files should be retained. works well.

also once you get something set up. make sure to test run a restore! a backup solution is only good if you make sure it works :)

I got out of the “surplus hardware” a while ago; way too expensive and noisy to run, so super recommend ditching the poweredge. for home use, I ended up just going with a USB3 JBOD for storage, and a Intel NUC (which I think they don’t make anymore). it runs a ton of virtualized servers under kvm, a virtualized NAS, all without issue because it honestly spends most of its time nearly idle. point is: it’s definitely nice to have it all in one case and with high speed storage but maybe having to find something that can house a ton of drives isn’t a strict need if you aren’t actually going to put a ton of load on it.

I hadn’t heard of CasaOS before; looks very cool. I am currently on TrueNAS and it’s been fine, but I had been running it in a VM because it wasn’t a good fit for running other things along side it. This seems like an interesting solution, thanks!