I had backblaze, and it’s really a bummer they don’t support linux. The closest one I’ve found is Icedrive, but it costs a bit more. I don’t mind paying a bit more though for a FOSS solution (technially not free but yeah). I probably only have 2 TB of actual important stuff but it would be nice to have more for future.
+1 for Restic on Backblaze. It’s cheap af for my setup because all my data is on a RAID 10 pool with snapshots. Then anything that needs to be safe from theft/fire/unlikely number of simultaneous failures gets sent to Backblaze.