I want to free some space used by Windows Backup, but I don't want to lose backed up files in the process. The program explains that I can indeed remove old backups to save space here:
However, it does not tell me if removing old backups will also remove files that hadn't changed since that backup was made. The file sizes do get smaller over time, so that makes me believe these are incremental... but there's no way I added 75GB of new files in October -- I was away on a business trip most of that period. So, how can I know for sure before I delete old backups?