Question

what do you mean by data backup ? why it is necessary?​

Answer 1

Answer:

The main reason for data backup is to save important files if a system crash or hard drive failure occurs. 2. Operation Plan B. There should be additional data backups if the original backups result in data corruption or hard drive failure.

Explanation:

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Answer 2

Answer:

data backup is making a storage of the data available on your computer on the day. you can select what is to be stored a copy.