I've been using a LaCie 2big NAS to back up my Macs for a year or two now, and it's generally worked fine. Now, however, we've got a couple of Mountain Lion Macs in the house, and it's stopped working. It takes forever to show up in the list of shares, and when it does, sometimes I can get my MacBook to back up to it, but often Time Machine just sits there for half an hour with a spinning barber pole and "Looking for backup disk". Sometimes this eventually results in a backup, but other times it doesn't.
I've seen some chatter on less reliable forums about AFP authentication changes in Lion and various system default settings you can change to get your Mac to accept older authentication methods, or whatever it is it doesn't like about the third-party NAS, but nothing I really trust. Can anyone help me out?
FWIW, one of our Mountain Lion Macs is running FileVault and the other one isn't, but they both seem unhappy with the NAS.