I have been using a Seagate GoFlex USB external drive to backup my two PCs. I'm looking to purchase a MBP 13.3 or 15.4 very soon. I have folders on the GoFlex for each PC with their backups (using NTI Backup) and I do manual backups weekly. My question is can I use the GoFlex with a folder for the MBP to manually backup files? I would hate to have to get an additional external drive just for the MBP.