Re: USB flash drive???
If you are thinking of portability of Data on the long run Flash disk or External USB Hard disk is OK each of them will be about 100US (2 GB flash or 40GB Disk)
But if you need to transfer data only once then the best is to get another hard disk (40 or 60 GB). In Pakistan you can buy it under 3000 Rs. and if you are outside you maybe able to get it free from a friend who upgraded his harddisk or has an old computer.
Use this Hard disk as Slave it will not only backup your data but will increase storage space.