What is the Clean Orphan Data when running DDB Space Reclaim.
Clean Orphan Data , what is it?

Best answer by Damian Andre
To explain a little more detail
In some very edge case scenarios, its possible some data was no longer needed or referenced by the DDB, but pruning of that data failed for some reason. It could be that the Media Agent rebooted or services cycled at an inopportune time, or that the request was never properly processed by the Media Agent. In some very older versions of the software, a bug may also have caused pruning to be abandoned and data was left ‘orphaned’ on the disk that was no longer needed.
This option was added to go find data that is actually no longer valid and can be safely pruned. Its a separate operation because we scan the disk for the files that are no longer referenced by the DDB, rather than scanning the DDB to find the files to defrag - if that makes any sense.
There should be no need to run this frequently, but every so often it may catch some data which has been orphaned. I think its much of a rarity these days but can’t hurt to run periodically.
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