Personally I think the best way to backup your SDMicro card is with a program called Karen's Replicator. It's a great program for all your backup needs. As it states on their website:
Automatically backup files, directories, even entire drives! Karen's Replicator copies selected files from one drive/folder to another. Source and Destination folders can reside anywhere on your network.
Options include repeated copies at intervals as short as a few minutes, or as long as several months, copy only files that have changed, and the replication of folder and file deletions.
New features allow you to specify which files should not be copied, and also which days a file should be skipped!
Here are a few screen shots. You can choose to match your SD card entirely or you can choose to not delete from your PC files that you have deleted from your BB. If you want to have your PC match the BB just check replicate file folder and file deletions in the job edit screen.