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.
