BORDSENIUS  I've used Mozy for 8 months now, and things generally work ok. The client is a bit of a CPU hog at times, but considering the price and the fact that i have backed up almost 1000 Gigabytes for 5 dollars a month, I can live with that. It has saved me a few lost fiels

I use time machine for my daily backups, and mozy for weekly backups. In that way it does not get too intrusive.  
(Version 1.7.3)

SVL  Mozy came a long way, from not being able to install when a Filevault image was present to long hangs, unexplained crashes and terrible performance.

However things are a lot better now. There are regular updates, support in my experience takes your claim serious but can't always solve it immediately and performance keeps getting better. The free alternative works well if you consider the price and their efforts to build a Mac backup client (that supports a private key) that will backup your most essential files when you're away from your comfy Time Capsule deserves a better review IMHO than those listed here.

Now why does one client has the 'all documents' option and mine doesn't? ;)  
(Version 1.7.2)

PROSPERO  Actually I don´t understand all these negative posts here. I use Mozy for quite some time now and all I can say is that it´s very very reliable.  
(Version 1.7.1)

ZAFAL  With me this tool was hardly working. It permanently lost the right data size on the server side, which could be recovered then lost again then couldn't be recovered. I was over weeks just busy with the support getting it to work again which isn't much of a backup. As soon as I said I had enough of Mozy and wanted to cancel my membership as it was not working as a backup tool the communication so far is on hold (for two weeks by now) as my case is "transferred".   
(Version 1.7.1)

DMU  Just bought and installed it yesterday. Doesn't work. "ClientError" After uninstall, reinstall, resetting the settings, trying all kinds of things for a good 10 times or so, I asked for my refund and cancelled immediately. If I can't trust them to even START backing up, how can I trust them to keep my data secure and properly restore.  
(Version 1.7.1)

KRIONI  Just tried this new version after having it not installed for a couple months (and totally non-functional for a couple before that!). Still _KILLS_ the performance on your computer. I have mine throttled as far as upload, but that didn't stop it from immediately attempting a backup process. After examining files for a half hour, it showed that it was starting a backup, which involved another ten minutes of "Communicating with server." MozyHome.app crashed the first time I tried to open it. The Console.app shows the following error multiple times: CoreEndianFlipData: error -4940 returned for rsrc type FREF (id 129, length 7, native = no)

Whatever that means.

In short, still the same slow, bloated mess. Find something else would be my recommendation - it's clear to me that whoever is developing this software cannot build a product that runs well on Macs.

Oh, when I clicked Stop it took several minutes to do so. And, my fans kicked into gear once it showed that it HAD stopped. I opened Activity Monitor and found that the MozyHomeBackup process was using about 100% CPU (maxing out one of my MacBook Pro's dual cores), heating up my Mac when it was supposed to be doing nothing! Force Quit that. Uninstalling again.

Don't tell me to contact Support - last time I tried to work with them was a nightmare. I clearly described a problem with the Mac OS X version and they responded with Windows troubleshooting steps. Once I finally got through to a "Mac" support person, the troubleshooting advice was to wipe out everything and start from a clean install. Did so, it worked for less than a week before the same problems came back. Of course, if you have more than 10 or 20 GB of backup data, that week-long window of functionality is less time than it takes to make a successful full backup.  
(Version 1.6.1)

SGGINC  I tried this because backing up apps like

Address Book and Ical required just a check box

and knowing where the files where located was

not necessary.

Program failed to backup the files and froze frequently.

Terrible program!

Ken  
(Version 1.6.1)

THYX  I'm at least glad to see that I'm not alone with the disastrous.

Just filled out their survey.

I truly believed the remaining Mac issues would be solved soon (and the trial worked quite well in late 2008)

thyx  
(Version 1.6.0)

CH5719  My experience with Mozy was terrible. It constantly lost its configuration, the handling of caches was corrupt all the time resulting in endless loops of rebuilding and the support was the worst. Never knew what the problem was, noone could me either. After reinstalling and setting everything up again and again, after a few times running the app, it lost its configuration again. Moreover, cpu and memory usage was unacceptable too. I lost a few days with this and wouldn't recommend this program in its current state to any mac user at all.  
(Version 1.5.2)

TOD WICKS  I had been using Mozy for the Mac since it was in beta in 2007. Things had been going along pretty smoothly until August of this year (2009) when suddenly connections would be dropped when backing up either of our two computers. I ran several network speed tests and all passed with upload and download speeds right at my ISP's specs. I uploaded and downloaded several gigs of files to my remote host and never encountered sluggish or complete shutdowns in speed. I was completely satisfied that my Macs and my network connection were reliable.

When I contacted Mozy "support," I got no response for a week. I sent multiple messages and included my primary and alternate email addresses as well as my phone number. Still no luck except an automated response providing me with a trouble ticket number.

I had had an email correspondence with one of their technical engineers in March or April so I began copying him on my emails. Even those went unanswered.

I found that Mozy had been acquired by some larger (ie cost-cutting) firm and one of the things that went by-by was the toll-free tech support number. There was no way to easily get in touch with Mozy support!

I tried the "live chat" route and had a drone on the other end who had no inkling of what I was trying to describe as my problem, even though I was copy-pasting info from the Mozy log into the chat window. She went off onto tangents, such as "What's your ISP?" "Uh, Comcast." "Oh, yes, Comcast has been known to have service disruptions in the past. Do you like lamb and curry?" I thought that well, every ISP has had disruptions in the past but I can prove that that wasn't the case with me.

I located the Mozy Business services blog and wrote a comment at random to one of the blogger's recent posts, begging him to get someone to contact me and help me get my backups working. A week later (now nearly three weeks into my odyssey) he responded and appeared to take some semblance of ownership of my case. Also at that point I simply wanted a refund of the unused amount of my advance subscription. Done he told me. Nothing further happened, no further contact with me.

Then I researched the company and found the VP in charge of Decho (Mozy) and wrote him a letter sent by the old-fashioned way - the USPS. No response. Dog-gone it. What is with this outfit where no one gives a flying teabag about a customer's problems?

Finally, on October 14, six weeks into this journey to nowhere, I get a note from someone informing me that my credit card account has been credited with the balance on my subscription. I quickly went to my CC online service center to verify (and to take a screen grab!) that I had finally been credited.

This outfit used to be really responsive. Now they simply wade about in copious amounts of deep kaka. Furthermore, the treatment I received has demonstrated yet again how truly awful off-shore tech support has become. Can you spell i-n-d-i-a? Very precise English but not an ounce of technical expertise or individual initiative. Why did no one take total ownership and responsibility of my case? Why did no one telephone me as I had suggested? Because those are things not spelled out in the little drone handbook and script they read from.

If you're looking for mission critical cloud backups, Mozy is NOT for you. However, if you enjoy online mystery or hidden object games, then try Mozy - see if you can find the hidden tech support engineer within five calendar days. Bonus points if you find the lamb & curry.  
(Version 1.5.2.1)