Anyway, this sent me on a quest for a path forward for myself.
My immediate solution was to buy a 4 TB SSD and copy the sensitive contents off the Drobo to that which I did.
I remembered that when I built The Next Decade, I included 2 4TB drives in a Storage Spaces mirror. The Drobo utilization was less than 2TB so that would easily be contained in the Storage Spaces mirror. And even then, probably 1/2 of the Drobo was old DVD rips that I could easily live without.
But then, I wouldn't have an off-site backup. I actually had never had an off-site backup of the Drobo.
As I studied the move from Trump to The Next Decade, I had to research how to switch my CrashPlan definitions to the new server. In that process, I found that I had UNLIMITED storage with CrashPlan.
So I copied the sensitive data (less than 1TB) from the Drobo to the Storage Spaces mirror and included that data in the CrashPlan backup. It took about 3 weeks for CrashPlan to upload that.
I'm sure you all use the 3-2-1 Backup Strategy (archive.org).
So now I had the data mirrored (1), backed up to the cloud (2), but not yet offsite (3).
I have been using Macrium Reflect for several years with good success. I was backing up to a 5TB USB drive that I kept offsite (3). But it bothered me that I had to install Macrium Reflect on each system. Subsequently, I only ran it on Trump.
You'll recall that I had experimented with Drive Snapshot. Due to complications of my own doing, it wasn't satisfactory for me at that time.
So I looked at it again.
This time it did exactly what I needed. It runs as a portable application. I just put the executable on the target drive. It does it's own compression and encryption.
I bought a new 5TB USB drive and am backing up not only The Next Decade but a collection of my laptops. I did a full backup initially and am doing differentials each month. As these backups are encrypted, I keep this drive offsite (3).
For those laptops, I had been using Windows System Image Backup. I still like that as that you can restore from a Windows Recovery Environment but it's all or nothing.
I have created a bootable WinPE disk to use to restore from Drive Snapshot.
Now, I'm looking at taking that interim 4TB SSD and mounting it as a NAS drive (4). You can't have too many backups.
To move data around, I used FreeFileSync.
It's been a journey.