After upgrading my MBP to High Sierra I am unable to restore any backups from my Time Machine (it's on an external hard drive). When I select any of the dates on the timeline no response as if there aren't any backups. I know there were backups though because I have restored old files when on the previous OS. I read that Sierra has a new Apple file system but surely I should be able to restore TM backups from the previous OS ? Does anybody know if I can retrieve these backups (or even specific files) or have they been deleted ? Please help ! Thanks.