1N-VAR (物资、人员等的)支持,辅助Backup consists of extra equipment, resources, or people that you can get help or support from if necessary. (物资、人员等的)支持,辅助
There is no emergency back-up immediately available.
手头无法获得应急支持。
Alternative treatments can provide a useful back-up to conventional treatment.
替代疗法能为传统的治疗提供有效的辅助。
2N-VAR 备用品;后备计划 If you have something such as a second piece of equipment or set of plans as backup, you have arranged for them to be available for use in case the first one does not work. 备用品;后备计划
Every part of the system has a backup.
系统的每个部分都有备用元件。
Computer users should make regular back-up copies of their work.