You can never have to many back-up plans. I have a number of hard disks that are copies of the current archive, as well as disks that are “snapshots” of the archive from various points of time. Usually every 3 years is archived off to a disk for storage. Because of the increase in file sizes over the years, what used to fit on a 1TB hard disk now fills a 4TB hard disk & the next archive batch is likely to need a 6TB hard disk. This is not including video footage which will be added soon as I will add a drone to my arsenal in the coming months.
I have used a cheap caddy to access the disks until now, however a cheap 4 bay caddy came up & so at least some of the off-line archive will be more easily available. I have at the same time ordered a 1TB SSD to replace the OS disk in my MacPro. So more fun coming up in the next few days.
I haven’t speed tested the enclosure as the likely bottle neck will be the speed of the old drives that are installed in it. But hopefully it will be fast enough for the occasional delve into the archive.
The reason for the decision to increase the amount of “online” archive was because a former client got in touch to re-licence some images that are from way back in 2001/2 & required me to pull a rather dusty HDD to retrieve the High Res originals.