Etymology
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backlog (n.)

also back-log, 1680s, "large log placed at the back of a fire" to keep the blaze going and concentrate the heat; see back (adj.) + log (n.1). Figurative sense of "something stored up for later use" is first attested 1883, but this and the meaning "arrears of unfulfilled orders" (1932) might be from, or suggested by, log (n.2).

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Definitions of backlog
1
backlog (n.)
an accumulation of jobs not done or materials not processed that are yet to be dealt with (especially unfilled customer orders for products or services);
backlog (n.)
the large log at the back of a hearth fire;
backlog (n.)
something kept back or saved for future use or a special purpose;
Synonyms: reserve / stockpile
2
backlog (v.)
accumulate and create a backlog;
From wordnet.princeton.edu