Bart

Bart is a file and folder backup tool, which transfers changes from multiple source directory trees to destination trees. When run, it will copy any files which have changed since the last run, bringing the destination up to date with the source in an efficient way, copying only files required.

Bart can read from a list of source directories, so not only can it keep your My Documents folder backed up, but also any other data stored on your drive in other locations. Direct the target of each of these folders at a network drive on another machine, a second hard drive in the same machine, or removable media such as a USB pen drive. When first run, all the files will be copied, and then on subsequent runs only the files which have altered will be updated, new files copied, and deleted ones removed.

Bart keeps the target completely in line with the source. It does not perform two-way synchronisation. If a file in the target was changed, on next run of Bart, it would be replaced with the file from the source.