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Objective of this lesson. Understand data archives and back-ups. Imagine a library. There are many different shelves Each shelf contains many books or CDs. Each book/CD is labeled with type and numbers (Eg. Zoology, 0001 to 0029) The library is very organised.

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Objective of this lesson

Objective of this lesson

Understand data archives and back-ups


Imagine a library
Imagine a library

  • There are many different shelves

  • Each shelf contains many books or CDs.

  • Each book/CD is labeled with type and numbers (Eg. Zoology, 0001 to 0029)

  • The library is very organised.



A data archive is like a library

A data archive is like a library.


A data archive
A data archive

  • A data archive is like a library

  • Each folder is like a shelf

  • The folder contains many files

  • Each file is like a book on the shelf.


Summary of a data archive
Summary of a data archive

  • An archive is very well organised so that people can find information easily.

  • We do not delete older archives because they are never out-dated. The collection keeps growing with new archives.

  • The storage media used for archive must be durable. Eg. Magneto-optical (MO) Disk.

  • An archive contains years of information which people can access.

  • We should protect archives from being modified because the information must be reliable.


Archive is a copy of data on durable storage media for long term storage and later access

Definition

Archive is a copy of data on durable storage media for long term storage and later access.


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VideoAngels & Demons



Definition

A back-up data is an extra copy of data that is important to you. It is to protect ourselves from losing this data.


Summary of a back up
Summary of a back-up

  • A back-up may not be well organised because it is a quick way to protect ourselves even if we lose the original data.

  • We delete older back-ups because they are out-dated.

  • The storage media used for back-up must have high performance speed. Eg. Magnetic tape.


Difference between an archive and a back up

Difference between an archive and a back-up?


Difference between an archive and a back up1
Difference between an archive and a back-up

  • An archive is very well organised so that people can find information easily.

  • We do not delete older archives because they are never out-dated. The collection keeps growing with new archives.

  • The storage media used for archive must be durable. Eg. Magneto-optical (MO) Disk.

  • A back-up may not be well organised because it is a quick way to protect ourselves even if we lose the original data.

  • We delete older back-ups because they are out-dated.

  • The storage media used for back-up must have high performance speed. Eg. Magnetic tape.


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