backup

始终记得为你重要的文件定期创建备份。

Always remember to create a regular ___backup of your important files.

如果出现任何问题，我们的项目团队已准备好一个强有力的备用方案。

Our project team has a strong ___backup plan ready if any issues arise.

看来他已经在备份内存的一个特殊文件中创建了一个副本。

It seems he had created a copy in a special file on a ___backup memory.