The correct answer is: B. Protecting data by copying it from the original source to a different destination.
A backup is a copy of computer data that is made and stored on a separate physical device or location. It is used to protect the data from loss or damage due to hardware failure, software corruption, human error, or natural disasters.
Option A is incorrect because adding more components to your network does not necessarily protect your data. In fact, it can actually make your network more vulnerable to attack.
Option C is incorrect because filtering old data from the new data is not a backup. It is a data management technique that can be used to improve the performance of your database.
Option D is incorrect because accessing data on tape is not a backup. It is a way of storing data that is often used in conjunction with backups.
Option E is incorrect because it is not one of the possible answers.