Just recently my Time Machine started telling me that i was running out of room. I currently have 500gb hardrives in both my Macbook and a separate attached to my AEBS. I wiped the Time Machine and decided to start fresh. My pre-backup data size is 445gb of data but when Time Machine starts to sync it says that my file size is now 530gb and a larger volume is needed. Where is the extra data coming from?