I have a very unusual problem in my environment currently - duplications of one specific Exchange database intermittently hang on a regular basis, but then run successfully on the next attempt if they are cancelled. I've provided logs and NBSUs to Symantec Support and they're investigating it at the moment, although it seems to have confused them so far!
In an attempt to continue trying to troubleshoot this myself as well, I have been considering delaying when SLP duplications start following a backup using the DUPLICATION_SESSION_INTERVAL_MINUTES parameter in the LIFECYCLE_PARAMETERS file.
However, ideally I'd like to delay duplication overnight but have the usual default of 5 minutes during the day for any manual backups. Is there any way of achieving this, with or without using the LIFECYCLE_PARAMETERS file?