Why backup...?

You should backup whenever your wanting to save files or any data to be used again in the near future.Depending on how much data your wanting to save and the format they're in there are many options to choose from including CD-R's and DVD-R's(for music and general animation),CD-RW's and DVD-RW's(for music and general animation however you have the ability to delete and re-add files),DVD-RAM(same properties asDVD-RW but with quicker access and easier to overwrite data),Blu-ray(better sound and picture quality than the standarised DVD,can hold 25gb,50gb and 100gb)memory sticks(can store many gb's and are small and easy to transfer data from computer to computer)