grandfather file

Definitions

Computing

  • noun the third most recent version of a backed up file, after father and son files

Electronics

  • For a given file, such as that being updated, the copy or version saved before the father file. That is, the current version is the son, the previous version is the father, and the version before that is the grandfather. Also called grandparent file.
  • synonymgrandparent file
http://www.dictionarycentral.com/definition/grandfather-file.html