accumulation of work, etc. that needs to be dealt with.

previous/older Postings of a conversation, which can run to many pages.

Previous demand that has not yet been dealt with showing itself as a queue

a pile of unfinished work

The amount of work or data that needs to be done as a result of a failure of some sort: Hardware, software, database, or connectivity. The amount of backlog is the work to be done once normal operations resume.

The effect on the business of a build-up of work that occurs as the result of a system or process being unavailable for an unacceptable period. A situation whereby a backlog of work requires more time to action than is available through normal working patterns. In extreme circumstances, the backlog may become so marked that the backlog cannot be cleared.

The value of contracts that have been secured but have yet to be billed out. The value of backlog tells a firm how many months of work they currently have contracts for.

What the IT staff member is always working on.

The amount of work in process in the factory. Usually expressed in terms of sales (sales backlog) or satellites (satellite backlog)

Overabundance of work or tasks that have not been completed.

Reserve of uncompleted work.

Volume of all requested maintenance work, yet not completed