In the Seagate FreeAgent GoFlex family, you can opt for the
Seagate GoFlex Desk 3.5" external drive if you want the large storage
capacity possible and do not mind a larger form factor. If you prefer
a portable drive, then you can go with either the Seagate GoFlex or
Seagate GoFlex Pro 2.5" external drives. The difference between the
two is that the Pro version has a dock and comes with premium backup
and encryption software.