I feel I have some experience here.
I have used Carbonite for the past 1.5 years (have roughly 6 months left on the 1 year subscription...for those that do not know Carbonite does not have a monthly subscription model, but 1 year at $55).
I have 210GB of stuff backed up (I had tried Mozy and it took forever to backup). So I went with Carbonite thinking it couldn't be any worse than Mozy, and it also took forever to backup (we are talking probably 6 or more months...probably a similar time to Mozy at that time). Also, to clarify my internet speeds have always been good in my area, so it was not a network bandwidth issue.
Well, in December I moved about 80GB of files around did some renaming. Well Carbonite didn't like this and started backing up those 80GB like they were new files. I thought no big deal, my backup will jump to about 300GB and then after a month Carbonite will remove those "deleted files" after the one-month grace period on removed files then my backup will drop back down to 210GB.
Here we are, in April now, and Carbonite had backed up 45 of those 80GB. I was thinking this is ridiculous how slow this is. I saw Mozy still was doing its 2GB free trial and I decided to test out its speed. When it did the 2GB upload in mere hours I said $5 for one month can't hurt. Well, 1-1.5 weeks later Mozy had backed up all 210GB (and this is with the computer being off for some time).
I am now a permanent Mozy customer and the 6 months left on my Carbonite subscription are just wasted money.
Also, one other Carbonite annoyance: Files over a certain size (and I have a lot of large ISOs from MSDN and games I have archived on my computer...also think they treat videos the same) are NOT auto-backed up. There are also many file extensions they ignore. This can be painful to go manually set each one.
I was worried I would have to redo all of this with Mozy, but it is as simple as telling Mozy to backup everything in 1-click, and it literally backs up every file no matter the extension or size.
I have no experience with Jungle Disk, but I hope I helped shed some light on the auto-backup software, as I have been using it for 1.5 years now.
Also, I feel the security it so strong on any of these you should not worry. Unless, of course, someone makes a quantum computer to hack your data...
