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1. 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)
    
2. The large log at the back of a hearth fire
    
3. Something kept back or saved for future use or a special purpose
   - reserve, stockpile

1. Accumulate and create a backlog

Derived forms: backlogged, backlogging, backlogs

Type of: accumulate, accumulation, aggregation, amass, assemblage, collection, conglomerate, cumulate, firewood, gather, pile up

Encyclopedia: Backlog