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We’ve bought ~20 of small glinets for testing purposes there were zero problems as long the plastic shell was off, with shell on they had cooling problems, but that’s about it.

You are overthinking it, without flushing ram everything works fine. OS inside VM would just boot as normal and that’s it.

You do not need to shut down services to make snapshots, why would you?

I won’t use fs snapsots as backups especially one as poorly supported on linux as zfs. I would go with external qcow disk snapshots and they can be pretty easily automated.

Don’t fret about ssd lifespan, unless you are planning on writing tb a day they will outlive your setup. I wouldn’t personally use zfs for this, unless you have a lot of memory just laying around.