Is there a free backup tool for Mac? I want to protect my computer from deletions or viruses. A friend of mine recently just deleted files from his computer and was unable to recover them.

The first thing you can try is using CMD (command command). There is no guarantee that you should make the files, but at least you should try it. A common situation is loss of files on USB and memory cards. If you have lost important documents from an external device, connect it to your computer and find the files using the CMD command.

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