Giáo trình ACNA - Chap04 pdf

BACKUP SOFTWARE• Windows Server 2003 Backup • Third-party software • Veritas Backup Exec • BrightStor ARCserve Backup... TYPE OF BACKUPSFull or Incremental Modified since last full or

BACKING UP AND RESTORING DATA

Chapter 4

CHAPTER OVERVIEW

• Describe the various types of hardware

used to perform backups

• Understand the difference between full,

incremental, and differential backup jobs

• List the capabilities of the Windows Server

BACKING UP DATA

• Why do we back up data?

• Why do we need to back up data?

BACKUP HARDWARE

• Capacity

• Speed

• Cost

CD-ROM AND DVD-ROM

• CD

• Inexpensive, widely supported

• Capacity up to 650 MB

• DVD

• Becoming less expensive

• Less support than for CDs

• Capacity can be over 4 GB

CARTRIDGE DRIVES

• Proprietary technology

• Zip (Up to 750-MB capacity)

• Jaz (2-GB capacity)

MAGNETIC TAPE DRIVES

• Use single or double spool magnetic

cartridges

• Low cost per megabyte

• Large capacity

• Reduce the need for manual intervention in backups

• Allow you to back up more data

• Preserves investment in media

SELECTING A DRIVE INTERFACE

• IDE

• Inexpensive

• Performance degrades drastically when

using more than one device per channel

• SCSI

• Faster than IDE, more suited to writing

continuous streams of data

• Might require additional host bus adapter

(controller)

BACKUP SOFTWARE

• Windows Server 2003 Backup

• Third-party software

• Veritas Backup Exec

• BrightStor ARCserve Backup

TARGET SELECTION

• Anything that is to be backed up is

considered a backup target, including:

• Single file or folder

• Entire drive

• Entire system

• Another system on the network

USING TREE SELECTION

USING FILTERS

• Filter on file creation date/time, size, or type

• Allows you to perform customized backups

• Can reduce the time needed to back up and the amount of media required

TYPE OF BACKUPS

Full or

Incremental Modified since last full or

incremental backup ClearDifferential Modified since last full or

incremental backup Not ResetCopy Backup – ignoring the

archive flag Not ResetDaily Based on today’s date Not Reset

BACKUP JOB TYPES: NORMAL

• Backs up all files

• Clears the archive bit

• Can require large data storage capacity

BACKUP JOB TYPES: INCREMENTAL

• Backs up only files that have been modified

or created since the last full or incremental backup

• Clears the archive bit

• Can require considerably less storage space than a normal backup

• Faster to backup than differential, longer

restore

BACKUP JOB TYPES: DIFFERENTIAL

• Backs up only files that have been modified

or created since the last full or incremental backup

• Does not clear the archive bit

• Can require considerably less storage space than a normal backup

• Longer to backup than incremental, faster restore

COPY JOBS AND DAILY JOBS

• Backs up files based on today's date

• Does not change archive bit status

SPECIFYING A BACKUP JOB TYPE

MAINTAINING BACKUP LOGS

• Allows backup software to keep track of

what file is on what tape

• Eliminates the need for administrators to remember detailed information about the contents of a tape

• Can be stored on the system hosting the

backup software or the tape

MEDIA ROTATION

• Provides a method to retain backups for a given period

• Prevents overuse of media

Common rotation methods include:

• Grandfather-Father-Son

• Tower of Hanoi

• Data compression that can often double the

amount of data written to a tape, with little or no performance impact

• Periodic restores should be performed to

test integrity of backups

RESTORING FULL BACKUPS

• Easiest of all backup methods to restore

• Restores latest full backup

• Restores the latest full backup

• Restores incremental backups from oldest to most recent

• Number of restore steps depends on the

time since the last full backup

• Restores the latest full backup

• Restores the latest differential backup

• Only two restore steps are required

DISASTER RECOVERY

USING WINDOWS SERVER 2003 BACKUP

VOLUME SHADOW COPY

• Periodically saves copies of files

• Can be used to restore previous versions of

a file

• Available only in Windows Server 2003 and Windows XP

• Also used by Windows Server 2003 Backup

to make copies of open files

ENABLING VOLUME SHADOW COPY

BACKING UP ACTIVE DIRECTORY

RESTORING ACTIVE DIRECTORY

Services Restore Mode

Nonauthoritative restore

been damaged, using the latest Active

Directory information from your other domain controllers

Authoritative restore

Directory objects that have been accidentally deleted using a System State backup

SUMMARY

backup software, and a plan for using them.

bit to determine what files need to be backed up.

from computers anywhere on the network.

files they have accidentally deleted or damaged.

object provides an easy way to back up Active

Directory.

Services Restore Mode.