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In information technology, a backup, or the process of backing up, refers to the copying and archiving of computer data so it may be used to restore the original after a data loss event. The verb form is to back up in two words, whereas the noun is backup.
Backups have two distinct purposes. The primary purpose is to recover data after its loss, be it by data deletion or corruption. Data loss can be a common experience of computer users; a 2008 survey found that 66% of respondents had lost files on their home PC. The secondary purpose of backups is to recover data from an earlier time, according to a user-defined data retention policy, typically configured within a backup application for how long copies of data are required. Though backups represent a simple form of disaster recovery, and should be part of any disaster recovery plan, backups by themselves should not be considered a complete disaster recovery plan. One reason for this is that not all backup systems are able to reconstitute a computer system or other complex configuration such as a computer cluster, active directory server, or database server by simply restoring data from a backup.
Since a backup system contains at least one copy of all data considered worth saving, the data storage requirements can be significant. Organizing this storage space and managing the backup process can be a complicated undertaking. A data repository model may be used to provide structure to the storage. Nowadays, there are many different types of data storage devices that are useful for making backups. There are also many different ways in which these devices can be arranged to provide geographic redundancy, data security, and portability.
Before data are sent to their storage locations, they are selected, extracted, and manipulated. Many different techniques have been developed to optimize the backup procedure. These include optimizations for dealing with open files and live data sources as well as compression, encryption, and de-duplication, among others. Every backup scheme should include dry runs that validate the reliability of the data being backed up. It is important to recognize the limitations and human factors involved in any backup scheme.

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  1. RicInOR

    What is the backup for GPS?

    Bloomberg - Are you a robot? 50k reported intentional incidents. Mostly by truckers!
  2. The Heretic

    Asthma inhaler OTC backup?

    You can buy Primatene Mist again, without a prescription I don't have asthma, but a lot of people do. Would this store for a period of time (i.e., more than a few months)?
  3. Bigbaddude

    Backup camera for hooking up trailer

    Thinking of buying a backup camera for my truck I am getting tired of climbing in and out of the truck to see how close the hitch is to the boat trailer. What does everybody else use there seem to be a lot of them out there to choose from.
  4. gun.deals

    Flip Up Backup Iron Battle Sights Rear & Front - $12.99 + Free S/H over $25

    Flip Up Backup Iron Battle Sights Dual Apertures Rear Front Sight for Rifle Rails - $12.99 + Free S/H over $25
  5. gun.deals

    Tactical Folding Front & Rear Set Flip Up Backup Sights BUIS Black - $8.25 shipped

    Tactical Folding Front & Rear Set Flip Up Backup Sights BUIS Black - $8.25 shipped
  6. gun.deals

    Flip Up Backup Iron Rear & Front Battle Sight - $13.26 w/code + Free S/H over $25

    Flip Up Backup Iron Battle Sights Dual Apertures Rear Front Sight for Rifle Rails - $13.26 F/S
  7. B

    Do you carry a backup gun and if so is it similar to your primary?

    For example, you carry a Glock 22, do you carry a backup gun that is a Glock 27 or something else, different caliber, different type of gun altogether? Or do you not carry a BUG at all? Why or why not? I personally don't carry a BUG. I'm just curious.
  8. gun.deals

    Front & Rear Flip Up 45 Degree Offset Backup Iron Sight - $15.33 shipped

  9. gun.deals

    Surefire Backup LED Flashlight - $87 shipped

  10. gun.deals

    Surefire Backup Click Switch Flashlight - $104.99 shipped

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