offline folders... can you enalbe a verbose log?

I have a user who is using offline folders

when he goes to sync it errors out

my problem is it was X number of files need ot be synced but when you view the offline cache Y number of files (less than X) are only local copies

I need a way to determine which files are not syncing so I can back them up and re create the cache

can someone point me in the right direction??