On Wed, 9 Feb 2022 at 17:57, Hamish McIntyre-Bhatty <d...@hamishmb.com>

> I finally got around to that, only to find that it was already enabled,
> and apparently not doing anything. As I don't leave my systems on 24/7,
> is it safe to assume that the timer isn't firing when the system is
> booted up later, after the configured time for TRIM has passed?

This depends on the configuration of the timer. The 'Persistent' field
controls this (see systemd.timer(5) ).

What does this say?:
systemctl show fstrim.timer | grep Persistent

Also, find out when it last triggered:
systemctl list-timers fstrim

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