GameSave Manager

Unless I'm missing something, you're describing functionality already available. Go to Program Settings -> Task Specific -> Backup Settings . Make sure the Create a separate archive... option as well as Create a new archive upon file change... option are both selected. Oh! Excellent! Thank you!

Allow an option to only create backups when changes have been made since the last backup. If xcopy is being used on the back end, then moving to the more robust and native robocopy would allow this. Alternatively a local db could be kept with the previous backup's size, modification date, etc, then ...