Hi Carlen,
I think of backup/archival storage as two items. 1: The backup I keep next to my edit station in case the drive I am editing on fails. 2: The backup I keep “off-site” (in my case a safe deposit box) in case my apartment burns up with editing station and backup.
I use spinning disks for these though of course you could use flash storage. You will probably get different opinions and data from different people regarding the long-term persistence of data on different media. Spinning disks do need to be “spun up” or accessed periodically to keep the memory from fading. I have no experience with archiving on flash storage devices.
I don’t use any clouds for off-site storage because of my slow upload speeds. I tried one service once but it was not practicable.
You can use RAIDs (multiple disk arrays) for either of two different purposes: to speed up disk access during active editing, or to create an automatic backup during active editing. The second approach would create an onsite backup — you would still need an offsite backup.
I can’t think of any reason to use a RAID for a separate onsite backup disk. That would seem overkill.
Hope this helps,
Robert
Robert Withers
Independent/personal/avant-garde cinema, New York City