father file[′fäth·ər ‚fīl]
A copy of the master file from the cycle or generation that precedes the one being updated.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
grandfather-father-sonA method for storing previous generations of master file data that are continuously updated. The son is the current file, the father is a copy of the file from the previous cycle, and the grandfather is a copy of the file from the cycle before that one.
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