So you don't create another 40+ disks in the future, get some kind of network attached storage (or an always on computer) and use it as a backup/media store for your backing up your everyday computers and a media store. Hopefully it will outlast several computers (I have had the same Drobo with 2 or 3 disks in RAID since 2014, had 1 disk fail).

Back it up with something one of the other commenters suggest - I actually use rdist to space on a friends computer (and vice versa) that's worked unattended for over 15 years (and free!)