what is data backup

hello my dear friend whatever you store either save data in your computer and that data can be destroy or could happen any thing for that you can make its copy so that if it get delete from computer you can restore it back for that function we take data backup and it help anytime so useful data should be taken backup

In information technology, a backup or the process of backing up is making copies of data which may be used to restore the original after a data loss event.

I want to believe it means you have the original data copy in a different disk and keep it in a separate location other than in the device you play with your data, in the case anything go wrong with your device or data, you have the backup to back you up.

well...in a nutshell, a data backup is when you back up your data.