I have a second desktop machine that is identical to the one in my signature ("one is none, two is one," etc.)
Upon reading the section of the manual on Acronis Universal Restore, I learned that one may restore a mirror image to a machine other than the one that created it only if all the following are identical: the processor, the motherboard, the mass storage device.
It then occurred to me that this likely means that, provided the machines are similar, a cloned drive created with one machine MAY function in another, despite its being a different mass storage device.
I'm happy to report that, from one of the three cloned drives that I created with Disk 1 in the below machine, I was able to place that drive in Disk 1 position in the second machine and use it to clone two more drives.
The end result is that each of the two machines now contains three identical bootable C drives.
The only program that recognized the different machine so far is Premier Elements 2018, however, this is not a problem as Adobe allows a single copy to be installed on two different machines.
My next project is to do the same with my two Dell laptops. From the one internal C Drive that I have already cleaned up and am currently defragmenting, I plan to create 3 cloned drives = two for each machine.
BTW, I did not place the Source drive for the desktops in an external enclosure, as recommended in the Acronis 2018 manual; however, I will do so for the laptop which the manual states is "especially important." Acronis maintains for the best possible result when cloning, the target drive should be located where it will be used, including using one and the same wires and clips. I'll report back later with the results.
Edit: 2/11 evening: When I was preparing to clone the Source Drive of my laptop from the external case, Acronis informed me that the it has lots of errors that should be fixed by Windows before using it. I'd already run the upper of the two in the Check Disk window below, so now I've been running the lower check box for the past 3 hours and I'm still at only at 75% complete.
Edit: 2/11@8pm: Acronis still not happy, so I'm now re-optimizing the Source Drive with the Performance Tab of NIS, after first cleaning it up with Norton.