hey there, i have a mid 2010 MBP running lion. my goal is to upgrade ($20) to mountain lion because my audio interface (apollo twin duo via thunderbolt) minimum requirement is to use ML. therefore backing up lion and setting up time machine is where im seeking some help. my external is a firewire owc mercury elite pro 2 TB and i have formatted it and backed up lion on it using superduper. no partitions. if i want to add time machine backup to my external will my Lion backup get erased. do i need to erase my HD and partition it and do a Lion backup and use time machine on the other partition. so there is where im at. do i need to jus keep my external as is and get a separate external for time machine? im an audio engineer so my external is for logic and protools sessions thanx n advance!