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I.e. treat `DeleteServerAfter == None` as "delete at once". But when a backup is exported, set `DeleteServerAfter` to 0 so that the server decides when to delete messages, in order not to break the multi-device case. Even if a backup is not aimed for deploying more devices, `DeleteServerAfter` must be set to 0, otherwise the backup is half-useful because after a restoration the user wouldn't see new messages deleted by the device after the backup was done. But if the user explicitly set `DeleteServerAfter`, don't change it when exporting a backup. Anyway even for non-chatmail case the app should warn the user before a backup export if they have `DeleteServerAfter` enabled. Also do the same after a backup import. While this isn't reliable as we can crash in between, this is a problem only for old backups, new backups already have `DeleteServerAfter` set if necessary. --------- Co-authored-by: Hocuri <hocuri@gmx.de>