A scheduled synchronization does a full sync, but the Run Synchronization action does only a delta sync. Updates are marked as expired if they are superseded by another software update or marked as expired in the update catalog. They are marked as expired only during the scheduled synchronization.
When a sync is run on a schedule, all changes to the software update metadata since the last scheduled sync are put into the site database. This includes metadata that is new (products, languages, and so on), modified, or removed. A manually run sync will be faster than a scheduled one because it downloads only delta changes to what already exists in the database.
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