When storing electronic documents on a computer, you should also:

The correct answer is A. Store the files in a backup system.

Explanation: Storing files in a backup system is crucial to protect against data loss due to hardware failure, accidental deletion, or other unforeseen issues. While keeping a paper copy can also be helpful in some cases, the primary focus should be on ensuring that electronic documents are securely backed up. Microfiche is largely outdated and not a practical option for most electronic documents today.