what is data backup?

Answer 1

Data backup means to make copy(ies) of the data in another device or media. This is so that copy(ies) of the data is available in case something happened to the original and it gets corrupted or destroyed.

For a standalone PC, this means copying (making a backup) into another hard drive, optical disks or thumb drives. Floppy disks are hardly used nowadays because of its low capacity.

For companies with large amount of data, the data would be backed up on another hard drive or onto tapes.

Answer 2

Data backup is the process to get the back up of the data in secure and effective way to prevent data from losing. There are many data backup software available which can be helpful for effective and secure data backup.

Answer 3

It's to copy files to a second medium (a disk or tape) as a precaution in case the first medium fails. One of the cardinal rules in using computers is back up your files regularly.
Even the most reliable computer is apt to break down eventually. Many professionals recommend that you make two, or even three, backups of all your files. To be especially safe, you should keep one backup in a different location from the others.

You can back up files using operating system commands, or you can buy a special-purpose backup utility. Backup programs often compress the data so that backups require fewer disks.