Backup is an English term meaning backup. It is often used in computing to indicate the existence of a copy of one or more files stored in different storage devices. If for any reason the original files are lost, the stored backup copy can be restored to replace the lost data.
Backup is highly valued by those who have already lost important information and were unable to recover it. Therefore, it is a highly recommended procedure due to the frequency with which digital information is lost, whether due to unreasonable user actions or malfunctioning systems.
Nowadays, it is very common to have the backup service available through online servers, with some of the most famous being dropbox, icloud or google docs. Online backup has the advantage of allowing access to saved data from any computer with internet access.
Other local ways to backup is to use an external hard drive, a USB stick, CD or DVD, among others.