Security
1.If a file is deleted then it is saved to another backup file .
2.You can make a file read only so that no one can overwrite it.
3.Encryption is when you change the plain English into words that make no sense that can then be turned back into English so people understand it.
4.Encryption is good because if you need to send a secret message then you can encrypt it so only the person who is meant to see the message can read it.
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