Regarding the custom encryption key, I think everyone should use a custom key. You don't make your email visible to all do you? Not that I have any big secrets but in case some hacker gets into their servers I'd like to know my custom encryption key will slow them down

Easy to copy and paste the key and Mozy gives you option when you choose a custom key to save it as a file to your computer.
I have the latest version of Mozy installed on my WinXP laptop and I have 140GB backed up (took several weeks). The only complaint I have is that they limit your upload speed to 1Mb/s. I just tried a couple of restores via Windows Explorer (Mozy integrated) and it worked flawlessly. Slow though, I'm in Western Canada and I have a 10Mb/s download link and I was getting average speeds of 1-2Mb/s. Hate to do a large restore.
I have the latest version of Mozy installed on my MBP using OS X 10.4.10 and the restore worked flawlessly as well.
Sorry to hear your restores didn't work. One thing I did when I first installed was use their encryption key, later I deleted all data, reinstalled Mozy app and then specified encryption key. if you restore using Mozy app you don't need to retype encryption key. I haven't tried restoring via web and using their decryption utility though.
I'm hoping their customer service delay is temporary and not like Parallels

Mozy has usually responded within a day to my questions. I've found the WinXP client to be extremely stable. The Mac client has never given me problems either but it doesn't have as many features as the Windows client - probably because still in beta.
The only other complaint about Mozy that I have is that if my external hard drives are turned off when backup starts, later when drives are turned back on, it takes a looooong time to recheck all the files to see which ones are not in sync.
PS - if anyone is new to Mozy and wants to give it a try, use my referral code (
https://mozy.com/?ref=62CUH1) and we'll both get an upgrade. Thanks.