The only way to upgrade the daoscat.nsf ODS is to remove and re-create this database. Unfortunatly, you will lose the 0 referenced NLO files ( when all database reference for a NLO are gone ).
When you recreate the daoscat.nsf, it will get a list of all NLO's and all references to NLO's. This will end up with lots of orphaned NLO's. The daos rebuild action will set the timestamp of those orphaned nlo's to the current time and date.
If you have set the "Defer Object Deletion" to 180 days because that will meet our SLA. When we set this to 180 days, we never have to restore NLO's from the backup. But when you re-create the daoscat.nsf, it will set the counter back to 0 for all 0-referenced NLO's again. Just after 180 days they are removed what will take a lot of diskspace.
Please let us upgrade the daoscat.nsf without rebuilding it.