backup

noun

1. 1

   the act of providing approval and support

   his vigorous backing of the conservatives got him in trouble with progressives

2. 2

   (computer science) a copy of a file or directory on a separate storage device

   he made a backup in case the original was accidentally damaged or erased

3. 3

   a musical part (vocal or instrumental) that supports or provides background for other musical parts

4. 4

   someone who takes the place of another (as when things get dangerous or difficult)

   the star had a stand-in for dangerous scenes

   we need extra employees for summer fill-ins

5. 5

   an accumulation caused by clogging or a stoppage

   a traffic backup on the main street

   he discovered a backup in the toilet