That's a response that took years to fashion, I know. .. Thanks.
What flavor or HDDs do you have in the OWC, and is yours a newer version? (Mine is from 2011, I replaced the fan once, it still makes noise, and I have no idea how to use the thing just leave it at RAID 5 and it is not making a funny noise. I used disk utility to check it and no errors, but I don't trust the thing.)
"2 Carbon Copy clones of my boot drive (to a 2 partition disk, backups done on each partition every other day"
So you have one computer backing that internal HDD to two partitions of the same HDD? Is that to give you two 'versions'? I thought the 3-2 back-up strategy was to have things on different physical drives, not a partition, or am I just misunderstanding you?)
"My main external disk is backed up to a Drobo 5D."
Is this the OWC? Is the OWC your 'main external' or do you have the OWC plus another disk? What kind? Is it a portable, or a desktop, USB3.0 or TB? My machine is so old it is Thunderbolt 2. I have a SATA plug in it, on the bottom (iMac), but the thing is wonky.
"Boot and main disks are also backed up to CrashPlan and Backblaze."
Those are clouds? Two?
Ya, I am seriously exposed right now. I bought an 8TB cheap portable from Costco last year, took all night to copy my OWC, and wasn't done even when I got onto a plane. I would up retiring it the thing was so slow. I have yet to back my stuff up onto anything redundant yet. I'm ready to run to Costco this morning. Try again! I just know it is good money after bad buying Costco. Been there done that. Thanks.