Make a backup of the file you are working on so that if you make changes to the data, you can reopen the original version. This is especially important if you are deleting information, reformatting or cutting and pasting: things do go missing! And it can be a pain to CTRL-Z 200 times to recover that phone number in the customer database.
Backup to a different location, on USB Key, CD-R or DVD-R, even online (if the files aren’t too big), on another PC in your network, even as an attachment in an email (but don’t send it!)… There are dozens of ways - the mistake is not to have at least ONE other backup.
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