A hard disk is on it’s way out, it has become very sluggish & occasionally refuses to write, no major drama though, even if it is holding the 2016 to current archive of images. I have ordered its replacement and installed it, now just the process of repopulating the archive from one of its back ups which will take 24 hours.
Remember if you only have a single back up, you don’t have a back plan. Mine is relatively simple I have:
Two hard disks for the Archive installed in my MacPro (which are identical & kept so using “Sync Folders Pro”. I also have two external hard disks which are mirrors of the Archive. This is for the on-line (or current stuff) most of the older images are backed up on disks that are no longer in my MacPro but can easily be accessed via a Disk Caddy.
My work flow is that recent images (and stuff currently being worked on are saved to two SSD that are on an Angel Wings X2) and when finished are then transferred to the Archive.
So hopefully I should be covered in the event of a catastrophic equipment failure be able to access the entire archive.