[Hampshire] Backup media

Hi,

There is already lots of data regarding backup media like CDs, DVDs, Tapes etc.
The best being off-site network backup to a remote backup facility.

I cannot find anything on usb flash disks.
Does anyone know how long data will last on a usb flash disk if I
store a picture on it, and leave it in a draw. How long before my data
fades?

Kind Regards

James