The correct answer is D. all of the mentioned.
A backup is a copy of computer data that is made and stored on a separate physical device or location. The purpose of a backup is to protect data from loss or corruption. Backups can be used to restore data after a disaster, such as a hardware failure, software corruption, or data deletion. They can also be used to restore data that has been accidentally deleted or modified.
There are many different types of backups, including full backups, incremental backups, and differential backups. Full backups make a copy of all of the data on a computer. Incremental backups make a copy of only the data that has changed since the last full or incremental backup. Differential backups make a copy of only the data that has changed since the last full backup.
Backups can be stored on a variety of devices, including hard drives, optical discs, tape drives, and cloud storage services. The best type of backup device for a particular user will depend on the amount of data that needs to be backed up, the frequency of backups, and the budget.
Backups are an important part of data security. They can help to protect data from loss or corruption, and they can be used to restore data after a disaster. It is important to make regular backups of important data and to store them in a safe location.
Here is a brief explanation of each option:
- Option A: to restore a computer to an operational state following a disaster. A backup can be used to restore a computer to an operational state following a disaster, such as a hardware failure, software corruption, or data deletion.
- Option B: to restore small numbers of files after they have been accidentally deleted. A backup can be used to restore small numbers of files after they have been accidentally deleted.
- Option C: to restore one among many version of the same file for multiple backup environment. A backup can be used to restore one among many version of the same file for multiple backup environment.