False promises. There's nothing that can annoy me more than that. Speed sucks, backup isn't entirely reliable, the cost is unreasonable. Good luck guys. My Mac is better off without you.

Mozy was my first cloud backup solution, but I have just abandoned it for Backblaze due to their switch from the unlimited plan. Even though I am not backing up a huge amount (200-300 GB of mostly photos and some movies) the new plan would more than double my current cost. Backblaze, however, will let me do this for $4 per month with a two year subscription.

Mozy offers a few more features, file "sharing" access, and a mobile app, but I have never used any of those features. I just want an inexpensive, fast, and reliable backup solution. If you have less than 125GB to backup then Mozy is still an excellent choice, but not if you have a lot more.

I've also found the Mozy application/prefpane to be a little slower at uploading than Backblaze, and a little more buggy. It tends to stop backing up a little more often than Backblaze, which on my network (3MBit/s) chomped through about 30GBytes per day!

Support can be much better! I asked them to stop the automatic renewal of the subscription! They simply answered they cannot! On my further question why they cannot they didn't even answer!

great concept - using it to back up 2 Macs (MBP & Mac MIni - including the full itunes lib) and one Windows machine.

The initial backup takes quite a while; but once done you don't feel the thing is running.

Backup's and transfer is encrypted.

Strongly recommend

I've been using Mozy for over a year, and it was generally working very well. My subscription is good for another years, but I will certainly not extend it now after the new prices came out. In my case, I backup a modest 160GB, and the new price would be more than three times higher than now.
One other thing I noticed a few days ago, and which I suspect to have happened "on purpose": I got an error that a required file was missing, and after Mozy resumed it showed me that it had to upload many GB of Data. I was suspicious, looked into what happened, and saw that the backup set now EXcluded my folders with photos and videos. Which for me was around 100GB of important information that was now EXcluded from backup. Basically exactly the data why I have bought an online backup solution.
I have heard that at least one other person had exactly the same "problem". So, guys, check your backup sets in the Mozy home program, and manually INclude your important data again.