I currently have a 27" iMac with about 60 purchased iTunes songs. I use a 2GB Sandisk flash drive to store the iTunes music (and some other files from my Windows computer) as a backup. When the 2GB is used up, what do you recommend I do to back up valuable things like iTunes purchases? Should I use my '06 HP computer drive as a backup (transfer iTunes folder to HP computer), should I buy another flash drive of higher capacity, should I buy an external hard drive, or should I use Time Machine (I currently have Airport Extreme). This is just a theoretical question for the future. I currently have about 1GB left on the flash drive, and I'm thinking of future backup options. Thanks.