How do I back up my music?

I need some help please. I have over 1300 songs in Dell Musicmatch. I
know I need to back them up, but I have no idea how to do this.
I use a MP3 player, and I have put music on the 1 GB memory card that is
with my MP3 player. I was able to that, but I have never worked with a USB
flash drive.
Do I buy a USB flash drive and copy all my music to it as a backup? If
so....I have no idea how to do that. I have a Dell computer Dimension 4700.
There is a slot in the front to insert the flash drive. I made the mistake
of not having a DVD slot put on the computer, I have only a CD slot as I
knew I would not be watching movies on my computer, I know..... a big
mistake.
Thank you for any help. It is much appreciated.



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