I am running desktop manager 4.7. MY OS for my 8900 is 4.6.1.239. When I try to back up via DM the process gets to the point where it transfers "Memory Cleaner Options" and then crashes saying that there is an "error backing up database(s)".
Sorry for the late bump here, but I had a similar issue that I solved a little differently.
I had to go line-by-line in the advanced screen doing individual backups. It turns out my problem was the "location-based services" option. From reading the forums, it seems like lots of people have had issues with backup, but for different issues in their backup. Given that, and the bad item for me being grayed-out, I suspect there might be something conflicting with my company's security policy.
In any case, I can run a backup if I exclude location-based services. Hope this helps someone else.
I have an 8900 curve on T-Mobile, OS version 4.6.1.114 (Platform 4.2.0.76)