I setup a maintenance plan to just backup databases. I selected only differential, expire after 7 days. It ran for the first time last night and most of the databases were backed up (full). Some however said they failed because they needed a full first. So my questions are as follows:
1. If I run a manual full backup on the databases that did not get backed up will the subsequent differential backups work?
2. Will the old backups be deleted after 7 days or does the expire mean something else? I believe I need to add the maintenance cleanup task to delete files but would like confirmation.
Basically the goal is to always have 7 days of backups, one of which is a full and the rest differential. Nothing more, nothing less, and no manual interaction needed to keep it that way.