Okay, using my phone browser, I asked Google yet again for information; this is the exact question.
“If Zorin 18 crashed and I needed to install it again can I then use my timeshift snapshot to restore my system to before the crash?”
Google’s reply stated that “yes, you absolutely can use a Timeshift snapshot yada yada yada” and continued to state that “Timeshift is designed specifically for this scenario.”
The response in Brave on my PC is similar but different.
I can now confirm that it appears to work (please note I am a novice and do not have the knowledge to detect if there are any faults with the drive I have restored) (I didn’t completely follow Google’s directives) and (I did run into issues).
Here is what I did and the results.
Shut down, disconnected my working drive; this is connected via SATA port 0.
My storage drive is connected via SATA port 1. This is where I have or had my timeshift snapshot.
I installed my cloned drive via a drawer, and re-powered my system, and all appeared okay.
Now this is a little bit of a grey area; when I loaded timeshift, something shut down and restarted my system??? After it rebooted and I started timeshift again, there were no snapshots available (something had deleted them, and I am not sure if it was possibly because I used the drive draw via SATA port 3) I checked my totally separate backup disc, and there are files there (thank goodness for backups), so I shut down and reconfigured my working and storage drives as per the original, removed the drawer, and rebooted. This confirmed that the storage drive was missing the snapshots that I knew had been there, and timeshift wouldn't create a new snapshot on my storage drive.
Long story! Turns out I had some drive error and ran a check disc to fix it.
Created a new snapshot after the fix, shutdown; this time I disconnected my working drive and installed my clone via SATA port 0 and restarted, and this time I had success; however, changes that I had done to my desktop were not set into place. (Note: I do not use my home folder for storage; there are a few links to my storage drive, and everything else is stored there.)
A quick Google search had me using Timeshift via live USB; this then set my desktop changes that I had made to my working drive, and now my clone drive is up to date with my working drive.
This gives me confidence that if for some reason my working drive fails, I can quickly insert my clone and be running promptly, giving me time to repair or replace the defective drive