backup
/ˈbækˌʌp/noun
A spare copy of data kept separately from the original so it can be restored if the original is lost or damaged.
Example sentences
- “Make a backup of your files before updating the software.”
- “Luckily, I had a backup of my thesis on an external drive.”
One word as a noun or adjective, two as a verb: you back up your files to create a backup.