Any system for re-using backup media, e.g. magnetic tape. One extreme would be to use the same media for every backup (e.g. copy disk A to disk B), the other extreme would be to use new media every time. The trade-off is between the cost of buying and storing media and the ability to restore any version of any file. One example is the Grandfather, Father, Son (GFS) scheme.
a person or thing that supports or reinforces another. a musician or singer or group of musicians or singers accompanying a soloist: a singer with a three-man backup that plays cello, bass, and guitar. an overflow or accumulation due to stoppage, malfunctioning, etc.: a sewage backup; a backup of cars at the tollbooth. a person, […]
- Backus-naur form
backus-naur form language, grammar (BNF, originally “Backus Normal Form”) A formal metasyntax used to express context-free grammars. Backus Normal Form was renamed Backus-Naur Form at the suggestion of Donald Knuth. BNF is one of the most commonly used metasyntactic notations for specifying the syntax of programming languages, command sets, and the like. It is widely […]
- Backward analysis
backward analysis theory An analysis to determine properties of the inputs of a program from properties or context of the outputs. E.g. if the output of this function is needed then this argument is needed. Compare forward analysis. (1997-11-23)
- Backward and forward
toward the back or rear. with the back foremost. in the reverse of the usual or right way: counting backward from 100. toward the past: to look backward over one’s earlier mistakes. toward a less advanced state; retrogressively: Since the overthrow of the president the country has moved steadily backward. directed toward the back or […]