Simply put, it allows you to backup, restore and transfer your GameSave(s) quickly and effectively.
No longer do you need to rummage through loads of directories, trying to find your GameSaves before formatting; GameSave Manager does it automatically.
Best of all, if a game isn't supported, you can add the game yourself using the "Custom GameSave Entries" feature.
GameSave Manager does not come bundled with any "nasties" (adware, spyware, etc...). It is 100% clean.
Info, Changelogs and support can be found here