Mozy for Mac is still in beta but I've found it much improved over the past few months. I've definitely got Mozy in "set it and forget it" mode at this point, with little or no tweaking or bugs to report. I get occasional "connection errors", but in the end I have very current backups with no intervention.

One thing to note: If you move a bunch of files around on your drive (say 10GB of photos for example), Mozy will initially report upon its next backup that 10GB will be uploaded. It's actually smart enough to compare the files on your HD with those on the server and only upload those that are actually changed. It'll take an hour or two to do the comparison if there are a lot of files, but it does a great job of uploading only what's necessary.

@ norz: Even better

@tafkas:
From https://mozy.com/account/referrals:
For every person that clicks on that link and starts using Mozy*, you'll both get another 256MB of free backup space.

The best thing is that every person that clicks on the link and starts using Mozy, will get another 256MB of free backup space. https://mozy.com/?ref=742EE0

@sleggat: I upgraded to 0.7, and my preferences still work with the new version. :)
However, Mozy will stop working if you move it from the Applications folder (eg: to a subfolder called "Backup").

I just upgraded to version 0.6.2.4 and it forgot all my preferences; login details, files/folders to backup and backup history. A minor inconvenience really as all my files were still backed up online and didn't need to be re-uploaded.

Yeehaw! This version has bandwidth throttling, making it possible to run it as an always on trickle-uploader without compromising your browsing speed or VoIP reliability.

I think the key here is to not put all of your backup eggs in one basket - in addition to keeping backups of things like Camino and Safari profile folders on Mozy, I also back up to an external HD, DVD-R, and FTP. While I like Mozy I'd strongly recommend against anyone using Mozy as their sole backup option.

I see solutions like Mozy to be "convenience backups" - places to backup files that aren't critically important to me, and yet would be nice to have backed up somewhere.

In any case, I'm still having intermittent communication problems with their server; whenever that happens, my system hangs somewhat, until the connection times out or until I force quit Mozy. And ttague is right - if a backup fails for some reason, it doesn't tell you (You can tell though, from the date it displays of your last backup). Nevertheless, it works often enough, and when it works, it works pretty well. Overall, I'd recommend it to anyone who likes living on the technological bleeding edge of things.

I'd be extraordinarily cautious about using this software for backups you rely on.

This worked well for me with the free version for a month or so - even allowed me to recover a file I deleted by mistake. All was good - so I shifted to unlimited.

Since that time it's been grief. Hung screens, etc - all that jazz. But worse than that - much worse - is that it isn't actually backiing up some of my files. I get a nice "Your Files Are Backed up Message" - but they ARE NOT on the server. If I look at the mozy logs there are thousand of lines of error messages about scan databases / caches / etc being locked.

I can deal with beta software. I can deal with problems. I can't deal with backup software that SAYS IT'S DONE THE JOB - and hasn't.

Support has been very responsive - but we haven't solved the problem. Until I see a couple of months of FLAWLESS performance - I'd stay away from this as a trusted solution.

Carbonite is coming soon. Works perfectly on my PC's. Looking forward to the Mac version.

I use SuperDuper! for backing up my hard-drive every other day but I'd been looking for an offsite backup service to ease my paranoia of having all my gear stolen/burnt. I've been testing out Mozy for a few weeks and I'm very happy with it. Unlike some people I didn't have any configuration issues. It just sits in the background, quietly uploading my files.