Backlog
/ˈbæk.lɒɡ/
noun
A large log to burn at the back of a fire.
A reserve source or supply.
An accumulation or buildup, especially of unfilled orders or unfinished work.
“He went to work on Saturday to try to work through the backlog of papers on his desk.”
verb
To acquire something as a backlog, or to become a backlog