Just use plain hard drives with spinning disks.* Make backup, then disconnect, then use a fresh drive next time, keeping at least 1 extra drive offline on a sh

Just use plain hard drives with spinning disks.* Make backup, then disconnect, then use a fresh drive next time, keeping at least 1 extra drive offline on a shelf or in a safe deposit box if you're extra paranoid. Keeping the drive off-site also helps to insure against fire, natural disasters or theft. Rotate drives regularly to keep the off-site backup fresh and to spread the (minimal) wear across several drives. When used in this manner and stored correctly, a set of say 3 to 5 hard drives can be expected to last a _very_ long time. * This is important, because solid state drives are not suited to long term offline storage, they can lose data surprisingly quickly if you leave them sitting on a shelf.