I think my ideal setup would be RAID in the computer itself(Although that's harder on laptops), a NAS with a non-redundant disk as an incremental target, and an

I think my ideal setup would be RAID in the computer itself(Although that's harder on laptops), a NAS with a non-redundant disk as an incremental target, and another 2 disks as a RAID pair just for storing large files, backed up to the backup disk. That way everything has triple redundancy overall, and incrementals, and there's some archive space for stuff too big to fit on a laptop, but the incrementals don't have redundancy, and you never backup a backup(Which would break the deduplication feature or Borg). What I actually do in reality, is try to keep everything important on my laptop drive, which I back up with Vorta to a USB hard disk, and some small important things live in Syncthing folders that are mirrored with my phone and tablet, because none of that is cheap.