Backup:
"It is a process of protecting user data or 
system state data on to separate storage device" 

NT supported only one type of storage media i.e. Tapes while 2000 & 03 supports tapes, floppies, HDD, Zip drives and Remote storage devices.
Ntbackup utility (comes along with OS) is used to take backup.



Types of backup
The Backup utility supports five methods of 
backing up data on your computer or network.

Copy backup
A copy backup copies all selected files but does not mark each file as having been backed
up (in other words, the archive attribute is not cleared). Copying is useful if you want to
back up files between normal and incremental backups because copying does not affect
these other backup operations.

Daily backup
A daily backup copies all selected files that have been modified the day the daily backup
is performed. The backed-up files are not marked as having been backed up (in other
words, the archive attribute is not cleared).

Differential backup
A differential backup copies files created or changed since the last normal or incremental
backup. It does not mark files as having been backed up (in other words, the archive
attribute is not cleared). If you are performing a combination of normal and differential
backups, restoring files and folders requires that you have the last normal as well as the
last differential backup.

Incremental backup
An incremental backup backs up only those files created or changed since the last normal
or incremental backup. It marks files as having been backed up (in other words, the
archive attribute is cleared). If you use a combination of normal and incremental backups,
you will need to have the last normal backup set as well as all incremental backup sets in
order to restore your data.

Normal backup
A normal backup copies all selected files and marks each file as having been backed up
(in other words, the archive attribute is cleared). With normal backups, you need only the
most recent copy of the backup file or tape to restore all of the files. You usually perform
a normal backup the first time you create a backup set.
Backing up your data using a combination of normal backups and incremental backups
requires the least amount of storage space and is the quickest backup method. However,
recovering files can be time-consuming and difficult because the backup set can be stored
on several disks or tapes.




Backing up your data using a combination of normal backups
 and differential backups is more time-consuming, especially if your
 data changes frequently, but it is easier to restore the data because the 
backup set is usually stored on only a few disks or tapes.
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