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Computing (FOLDOC) dictionary (also found in English - English (Wordnet), )
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Saving the current state of a program and its data, including
intermediate results to disk or other non-volatile storage,
so that if interrupted the program could be restarted at the
point at which the last checkpoint occurred. This facility
came into popular use in mainframe operating systemss such
as OS/360 in which programs frequently ran for longer than
the mean time between system failures. If a program run fails
because of some event beyond the program's control
(e.g. hardware or operating system failure) then the
processor time invested before the checkpoint will not have
been wasted.