I have Time Machine backups going back a while. I recently got a new MacBook Pro and did a clean install of apps (not from Time Machine). Now, I can access the old backups (only in Finder... I can drill into old backups and move files etc but I can not access them using Time Machine- they do not show in the history). When I try to set up the same external drive to back up, it tries to set up a new machine in the remaining space left on the disk. I know I can wipe out the old backups and start again but I would rather keep the old backups and set up my new machine to be on the same disk as continuation of the old Mac not as a new Mac. Is there a way to do this?