no, this value is left default / set to "0".
And I'm talking about Incremental Backups of Oracle (RMAN) or HANA Databases.
The StoragePolicy assigned to the subClient also uses an incremental StoragePolicy.
By this, Full and Incremental Backups can be written to different Media.
I use the same Retention on the full and increment StoragePolicy(Copies).
But after defined retention period, full backups are delete/aged, even though dependent Incrementals are still to be retained.
Logfiles / Archivelogs are backed up to a separate StoragePolicy anyways.
And without a valid Full, I don't see how to make use of an incremental or log backup at all.