When backing up a machine with a monitor using logind to control idle
timeout and things like DPMS, borgmatic can block the screen from
turning on/off with systemd-inhibit. This is because by default
systemd-inhibit will block "idle:sleep:shutdown". Borgmatic does not
need to care about idle, only about suspend and shutdown. So, add an
explicit `--what` flag for what borgmatic should inhibit.
For more information see systemd-inhibit(1).
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