There are many reasons why backing up matters. In my experience, the most important reason is sudden damage to the main storage device. When the main storage device fails, your computer or laptop becomes inaccessible, preventing access to your data. If the loss is catastrophic, this can result in a total and unrecoverable loss of your important files like documents, pictures, and music.
Having backup software automate regular backups prevents you from having to think about, or remember to do it yourself.
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