Status "scheduled" over hours, but archiving doesn't seem to start

There are two scheduled save requests (3.9.2021, 02:08:04 and 3.9.2021, 06:58:36) for which the archiving process doesn't start. Possibly an error, but no further information given in the "Info" row of the list of Save requests. - Thanks for checking!

Update (3.9.2021, 08:40): the second mentioned request has succeeded.

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Migrated from T3546 (view on Phabricator)