如果发生重大系统故障，IT部门有一个专门的团队随时准备提供支援。

In case of a major system failure, the IT department has a dedicated team ready to provide ___backup.

任何司机在车里放一套跨接电缆作为有用的备用工具是明智的。

It's wise for any driver to keep a set of jumper cables in the car as a useful ___backup.

由于作为关键资金支持的额外拨款，这个研究项目得以按时完成。

The research project was completed on time thanks to the extra funding which served as crucial financial ___backup.