backup

1. (Noun) The copy of files or data.
Where did you put the backup?


2. (Noun) Support or help.
A police officer requested backup.


3. (Adjective) Being secondary.
So, what's your backup plan?


:: Note ::
"Backup" is derived from the verb form "back up". (It is written separately)
The copy of files stored somewhere other than the original location such as external hard disk, flash disk, compact disk, etc.
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