OptionaldayThe day of the month on which to take the snapshot, in [1, 31]. In shorter months the snapshot is taken on the last day instead (day 31 runs on Feb 28 or 29, and on Apr 30), so every month gets exactly one snapshot.
OptionalhourThe hour of the day, in UTC, at which to take the snapshot, in [0, 23].
Take a snapshot once per month, on the configured day at the configured hour.