portable storage for backup

[Marlin]

I'm a new vaio user.vgna115m laptop.What are the essential differences between a pen drive and a memory stick? For data base, spread sheet, and general mail and word documents how many MB do I need?

[kee-lo_]

A 32MB card should be enough.

1) a memory stick needs a memory stick drive (not portable if you don't have two VAIOs)

2) a pen drive uses USB therefore is independant of any drive, and can be used on any PC