The program creates a copy of your specific data and directories, and then updates those copies whenever there is a change to the original. It's a very useful app for making backup copies for external hard drives and USB memory sticks.
Bvckup makes the copies easily and quickly, and it updates them automatically in real time if you set it to do so. Or, if you prefer, you can do it manually.
You must keep in mind that Bvckup is not meant to synch folders, and it neither compresses, encodes or restores them. The program centers on copying content from one directory to another.