Or … none! Because forcing a string always results in an OnCalender=
setting, but an empty string leads to an empty value.
> postgresqlBackup-hass.timer: Timer unit lacks value setting. Refusing.
or
> postgresqlBackup-miniflux.timer: Cannot add dependency job, ignoring: Unit postgresqlBackup-miniflux.timer has a bad unit file setting.
I require the postgresqlBackup in my borgbackup unit, so I don't
strictly need the timer and could previously set it to an empty list.
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