User manual

Glossary
Nero BackItUp 68
18 Glossary
Backup
Copying data from the computer to an alternative storage medium. Backups are created in a
special format with the help of a backup program.
Bootable CD
Booting refers to loading the operating system when a computer is started. This is normally
done from the hard drive. However, if you do not want to boot or cannot boot your computer
from your hard drive for whatever reason, you can load an operating environment from the
drive with a boot CD.
CRC
Cyclic Redundance Check refers to an error-detection procedure used during the transmis-
sion or copying of data. A checksum is calculated with a defined amount of data at the be-
ginning, and provided with the data block. After the operation has ended, the checksum is
calculated again and compared to the first value. Deviations indicate the presence of errors.
FTP Server
An FTP server is a data storage unit that can be accessed through the Internet. Access is
usually anonymous. FTP servers are frequently used as storage locations for backups.
Master Boot Record MBR
The Master Boot Record (MBR) is located in the hard drive's first sector. It contains a boot
file that starts the operating system. It also defines the drive's partitioning.
Restore
Restore stands for restoring data to a previous condition or to copying data by using a back-
up copy that was created previously and a backup program, e.g. Nero BackItUp.
Shadow Copy
A shadow copy is a snapshot of a file at a certain point in time. The advantage is that you
can keep working with this file while the backup program, e.g. Nero BackItUp, backs up the
file in the background. This feature is particularly relevant when you want to save system fi-
les, which are modified continuously by the system.