ERICSACKETT  Data Backup 3 is very good as a backup and archiving program. It fills in that spot that SuperDuper and Time Machine miss. It suffers a bit in its interface and ease of use, but I've never had a problem with it.  
(Version 3.1)

TVALLEAU  I've been using DataBackup for several years now. Contrary to other reviews, I've not had any trouble with it at all. No "internal errors" - nothing. For me (currently on 10.5.8) DataBackup "just works" and I'm delighted with it. I use it in conjunction with Super Duper. I'm a semi-retired Mac programmer, and so I've used it "in both directions" (meaning backup and restore both) and it's been there for m 100% of the time.

Neither have I had trouble with the company; they have been quite responsive the few times I've dealt with them.  
(Version 3.1)

SHERMAN WILCOX  This application is not compatible with Snow Leopard, won't even launch. Prosoft's website has claimed an upgrade will be released "in the next few days" since the release of Snow Leopard, but there is still no compatible version. This is simply unacceptable for a critical utility such as this.   
(Version 3.0.5)

SJG70  This backup software does all that I want (backing up my harddrive, cloning, maintaining a copy of my PDF library on a Flashdrive). I think their support deserves some praise: they recently very efficiently resolved a problem I was having, quickly providing me with very clear, comprehensive information. In fact it is probably the most professional support experience I've had. They obviously want the software to work for you.  
(Version 3.0.5)

JEFF NAILEN  I've had major problems with Data Backup over two versions: version 2 and the new version 3. I've really wanted to like this app as a highly recommended alternative to Retrospect. But I've had a series of problems over the years including executor problems and 'internal errors' once I finally got past the executor problems. What's worse, when I contacted tech support they just wanted to sell me the upgrade to version 3 rather than help with my problem. I had to be persistent and send more emails before they would actually provide tech support. Bad sign.

Like a fool, I went ahead and upgraded to version 3 anyway (hoping it had been improved with the upgrade) after the executor problem had finally been solved by tech support only to encounter 'internal errors' when making routine, albeit extremely slow performing backups with version 3.0.5 (on a system I keep clean and running smoothly by performing routine weekly and monthly maintenance with the best utilities and no hacks).

When this happens the backup stops. When you resume the backup after having to quit Data Backup and restarting, it doesn't pick up the backup where it left off, but starts over making it extremely slow. But it never finished a single complete backup due to 'internal errors' that are never explained so there's no way to solve the problem.

Needless to say, I no longer use it because it simply doesn't work and tech support is slow and unresponsive. After doing much research including reading Joe Kissell's excellent Take Control eBooks, I now use dedicated apps for dedicated backups: Time Machine + an Apple Time Capsule for automatic hourly archive backups; the excellent SuperDuper for automatic bootable duplicates to an external drive; and CrashPlan Pro and BackJack for automatic offsite backups over the Internet. Once it's all set up as explained in Joe's eBooks it works consistently like a charm with no hassles. That's the way it should be.

Don't buy this product; there are better ones out there with better tech support.  
(Version 3.0.5)

DCH1951  If you ever have any problems or issues with this excellent program, simply delete it in it's entirety;

I recommend either the included Uninstaller, but AppZapper or AppCleaner work fine as well. Reinstall it, run Disk Utility/Repair Permissions, then restart your Mac. Launch it, enter your registration info and everything will work as it should. This fix was provided by ProSoft, the author of the utility.  
(Version 3.0.5)

PROWL  Data Backup completely saved my computer.

I had recently acquired Data Backup and was still in the trial mode in version 3.0. It was time to upgrade from OSX 10.4 to 10.5. For the first time ever, I made a clone of my entire hard drive prior to the system "upgrade and archive". I had never done this before, because Apple stuff "just works".

Well, this time it didn't work. The 10.5 installer crashed, and left behind enough garbage on the disk that I did not have enough space to do another upgrade. My only option was to "erase and install" on a currently un-bootable computer. I did the erase and install, and used the Migration Assistant (Mac) to migrate all the files from the clone back to my computer.

Everything was back to working - no data lost.

The free trial (by fire, as it turned out) clearly demonstrated the value of the program, and I bought 3.0.4.  
(Version 3.0.4)

JOHN LOACH  I own three products now from ProSoft Engineering - Drive Genius, Data Rescue, and Data Backup. All three work exactly as described, with a very professional appearance and great attention to getting the job done.

Data Backup is fast. Once you've created the initial backup, the subsequent version backups are fast and accurate. Restoring files from version dates is very easy and quick.

Support is excellent, too. Good customer forum, and updates are always worth the investment.   
(Version 3.0.4)

ESPIRIDION  As a comment to the previous reviewer, Time Machine is NOT a replacement for this type of software.

Regarding Data Backup 3.0.3, when it works it is great. It’s not complicated and does what it’s supposed to do. In the past I cloned one drive and synchronized another.

Unfortunately, there are many bugs while creating and saving -or trying to save- new sets. For example, sometimes after I select the source and destination drives, the summary at the top indicates “”.

Other times, after I select a destination drive, a different drive is selected by Data Backup. This is absurd.

Finally, when everything seems to work out fine and I decide to save the set, Data Backup quits. It’s unusable.

I have recommended Drive Genius and Data Rescue II, but this one is pretty bad. Unfortunately the last time I contacted Prosoft I just received the following two messages:

“Your comments have been forwarded to a Sales Agent...”

“Your question has been forwarded to a Customer Support Specialist...“

I never got a response addressing my actual problem. I may email them regarding this issue, but meanwhile I’m giving Synk another try.  
(Version 3.0.3)

MAC-KIWI  It's obsolete with OSX 10.5. "TimeMachine" is the Future.   
(Version 3.0.3)