What does Backing Storage mean?

Backing Storage meaning in Computer Science Dictionary

In mention of computer system storage space, backing storage is any device, or medium, that computer system information can be saved on and it is usually non-volatile. Typical forms of supporting storage space devices or method are difficult drives, floppy disks, CD or DVD discs, memory sticks, and magnetized tapes. Information is typically conserved to these kinds of storage space for very long term keeping, like income tax records or other essential documentation.