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One significant drawback of encrypting stored data is that it may result in data loss if the encryption key is lost. Encryption works by transforming data into a secure format that can only be read or processed with the correct decryption key. If this key is misplaced, forgotten, or otherwise becomes unavailable, the encrypted data becomes inaccessible. This is particularly critical as encrypted data is often sensitive or crucial for business operations. Therefore, safeguarding the encryption key is as important as securing the data itself to ensure that it can be retrieved when needed.

In contrast, the other choices either misrepresent the impact of encryption or refer to aspects that are not inherent drawbacks of the encryption process itself.