back-up
n
1 [U] support; reserve 支持; 支援; 後備
The police had military back-up. 警方有軍隊作後盾.
[attrib 作定語]
back-up services 善後服務
the back-up team of a racing driver 賽車手的後勤隊.
2 [U, C] (computing 計) (making a) copy of a file, program, etc for use in case the original is lost or damaged (制作)(文件、程序等的)復制件(以備原件丟失或損壞時使用)
[attrib 作定語]
a back-up disc 復制件磁盤.