FileGroup is a files / directories combiner that groups files / directories to reach a precise size. This is very useful when you need to back up on size limited storage, without splitting anything.
The group sizes can be any know storage size, or any other arbitrary size. This way there is no lost space when backing up. The created groups can be built on the hard drive by making new directories and copying, or moving, the files / directories of those groups.
Doing this manually, you would try to select some files in the Explorer and check the total size to realize its too low, or too high, and try again, and again... Using FileGroup, you would have to click a button. Very user friendly (drag & drop from the Explorer).

The license of this software is Freeware, you can free download and free use this file management software.