Since 2011, I have had two 1tb WD hard drives in an Icy Box 2 bay External RAID Storage Enclosure. This I run in RAID 1 mode, so the two drive are mirrored, ie I cat two copies one on each drive. This has worked well for me and I only run it when I want to back up some photos, so not a lot of use over the last 13 years.
I have, including some duplicates 139,855 photos backed up from my PC. So in effect I have 3 copies of the photos on each of the three drives. I believe in the aviation world this is referred to as triple redundancy
.
As the system is getting a bit old and running out of space, (13 years ago my files were in the order of 1.5mb each, now they now range from 10 to 18mb
) I have bought some new kit to do the same thing...
A more modern Icy Box External 2 Bay RAID System and two Seagate IronWolf, 4TB, NAS, Internal Hard Drives to go in it. Hopefully that will do for the next 13 years.
Bought the bits on Amazon Black Friday, but I have Not set it up yet.