If you’re concerned about your files, back them up. Windows and MacOS both have built-in backup tools.
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WannaCry actually attempts to remove any Windows backups if it is able to access them. Make sure to use a backup solution that is immune to this, using a 3rd party backup provider for instance.

Src: http://sensorstechforum.com/wncry-file-virus-remove-restore-files/

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