OK, I did boot from another drive - the clone - in order to test it.
Now that you mention it, when I booted up from the clone I did notice Time Machine starting a backup, up so I clicked "Skip This Backup" to stop it.
I don't recall this happening before, but maybe I just didn't notice it before - or maybe I was lucky.
I wonder if Time Machine starting up on the clone caused it to do a full re-sync next time it ran on the primary drive - and if so, how to prevent it happening in future. Maybe I should just turn off Time Machine, immediately after booting up on the clone.
Last edited by jmsgwd; 02-05-2018 at 11:59 AM.
Reason: Minor edits for clarity
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