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Answer:
Best way to store all your files is a external storage device, like a hard drive or a usb stick, copy all your files to the device and keep it in a safe place.
Answer:
Like ordinary random access memory (RAM), it can be repeatedly read, written to, and erased. Intended mostly for removable computer storage, DVD-RAM provides the capabilities of Rewriteable CD (CD-RW) - users can run programs from the discs, copy files to them and rewrite or delete them.