Backlogs refer to a pile up of work or tasks that have accumulated over time. While it is often used in the context of work or projects, there are several synonyms that can be used to convey a similar meaning. One such synonym is "pile-up", which implies that tasks have been added continuously over time. Another synonym is "accumulation", which suggests that tasks have built up over a period of time. "Backlog" can also be replaced with "overload" which emphasizes the excessive amount of work that needs to be done. Other synonyms include "stockpile", "buildup", and "stack-up". Ultimately, the choice of synonym will depend on the specific context and the degree of urgency of the situation.