Moha Gandhi Roll no: 28
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 ?
Why Backup ? ? ?
Power failures Computer viruses
Why Backup ? ? ?
What Causes Data Loss?
Hardware failure Human error Software corruption Theft Computer viruses Hardware destruction
40% 29% 13% 9% 6% 3%
Source: David M. Smith, Ph.D., Pepperdine University, 2003
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.
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.
How Often ? ? ?
File type Back up daily Data files YES Critical files YES All other files -
Back up weekly YES YES YES
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.
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