I'm in the process of upgrading my (2 bay) NAS capacity. I'm currently running my NAS with 2x 1 TB HDD's in a RAID 1 configuration. I'm waiting for a couple of 8 TB disks that will arrive to me in a week or two. Given that RAID is not a backup, I'm questioning if I should rebuild my NAS with the same RAID 1 configuration. Can't see a real advantage in using RAID 1 vs single disk inside NAS + USB external enclosure containing the other single disk to use as a cold storage backup (physically connect the disk only once a month). It looks like the only benefit of RAID 1 is to not losing the new data between monthly USB backups in the case of a single disk failure.
Or do you think it's still worth to have RAID 1.....and USB backup of course (so I will have to purchase an additional external 8 TB disk).
PS. do you have an idea on how to reuse the old two 1 TB disks?