| In
Information Technology, a backup
or the process of backing
up refers to making copies
of data so that these additional copies
may be used to restore the original after
a data loss event. The verb is back up
in two words, whereas the noun is backup
(often used like an adjective in compound
nouns).
Backups are useful primarily
for two purposes. The first is to restore
a state following a disaster (called disaster
recovery). The second is to restore small
numbers of files after they have been
accidentally deleted or corrupted. Data
loss is also very common. 67% of internet
users have suffered from serious data
loss.[2]
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. A data repository
model can be used to provide structure
to the storage. In the modern era of computing
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.
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