1) "Isdn" -- As to isdn backup
ISDN
Function: abbreviation
integrated services digital network
Pronunciation Symbols

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2) "Backup" -- As to isdn backup
back·up
Pronunciation: -"&p
Function: noun
Usage: often attributive
1 a : one that serves as a substitute or support <a backup plan> b : musical accompaniment c : additional personnel who provide assistance
2 : an accumulation caused by a stoppage in the flow <traffic backup>
3 : a copy of computer data (as a file or the contents of a hard drive); also : the act or an instance of making a backup
Pronunciation Symbols

In information technology, backup refers to the copying of data so that these additional copies may be restored after a data loss event. Backups are useful primarily for two purposes: to restore a computer to an operational state following a disaster (called disaster recovery) and to restore small numbers of files after they have been accidentally deleted or corrupted. Backups differ from archives in the sense that archives are the primary copy of data and backups are a secondary copy of data. Backup systems differ from fault-tolerant systems in the sense that backup systems assume that a fault will cause a data loss event and fault-tolerant systems assume a fault will not. Backups are typically that last line of defense against data loss, and consequently the least granular and the least convenient to use.

Since a backup system contains at least one copy of all data worth saving, the data storage requirements are considerable. Organizing this storage space and managing the backup process is a complicated undertaking.

1 Storage, the base of a backup system

1.1 Data repository models

1.2 Storage media

1.3 Managing the data repository

2 Selection, access, and manipulation of data

2.1 Approaches to backing up files

2.2 Approaches to backing up live data

2.3 Backing up non-file data

2.4 Manipulating the backed up data

3 Managing the backup process

3.1 Objectives

3.2 Limitations

3.3 Implementation

3.4 Measuring the process

4 Lore

4.1 Advice

4.2 Events

5 Glossary of backup terms

6 See also

Further Data On Term for isdn backup
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