Functional characteristics and applicability of the backing store.
1. The backing store should be off sight meaning that files should be held in another separate location away from the computer room. This is to ensure that in case of any risk in the computer room, the back up data will be available.
2. The backup storage media should be large and extensive enough so as to provide enough storage capacity. This s to ensure that adequate data is held in the store. For example, through the use of magnetic tapes.
3. Backing storage devices should facilitate easy retrieval of data. This is to ensure that in case of any loss of data from the main storage it can always be accessed and used within a short period.
4. The backing store should be well maintained mostly a librarian since it is the only source of data held in case that in the main storage is lost.