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					Backup Strategies

Moha Gandhi Roll no: 28

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The WHYs & Whats
 Why Back Up ?

 What needs to be backed up ?  When do I take backups ?
 How often should one take backups ?

 How long should the data be stored ?

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Why Backup ? ? ?
 Natural disasters

 Power failures  Computer viruses
 Terrorist risks

 Human errors

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Why Backup ? ? ?
What Causes Data Loss?

Hardware failure Human error Software corruption Theft Computer viruses Hardware destruction

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40% 29% 13% 9% 6% 3%

Source: David M. Smith, Ph.D., Pepperdine University, 2003
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What Needs To Be Backed Up?
 Data files—the files that change on a frequent basis  Entire system in case of a catastrophic disaster
 System files that contain specific user information for customized settings and passwords

 Files that have changed since the last backup, or individually selected files.

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When Backups ? ? ?
 Off-hours time frame – The ―Backup window‖

 For 24x7 - little or no backup window In this case, determine a time period when employees will be the least affected.

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How Often ? ? ?

File type Back up daily Data files YES Critical files YES All other files -

Back up weekly YES YES YES

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How Long ? ? ?
Data files that change frequently- keep only the most recent files

 Full set of files – store the files in a secure, off-site location.
For certain types of data (tax records, contracts, personnel files, patient records, and so on), - need to archive data for a specified time period to meet specific legal requirements.

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Storage Technologies
Direct-attached storage - Attached to a single server Network-attached storage - Appliances link to LANs
Storage area networks - Dedicated storage networks or sub networks that can be shared by several servers

ATA and IDE - Typically found in desktop systems and low end servers, is often used to connect various storage drives to the system
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posted:11/5/2009
language:English
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