Flashcards
Data Compression & Backup
Cards in this deck (5)
- 1What is Compression?> Reduction of a file size (and therefore disk space taken up) by applying a certain algorithm
> Algorithm is either lossy (not all original data can be recovered) or lossless (no data is lost)
> Files must be decompressed before they are read again - 2What are some Examples of the Uses of Compression?> Archived files, i.e., those that won't be accessed regularly
> Files that are to be transferred on a network, to speed up network transfer - 3What is Backup Software?> Software that creates a copy of important data, and stores it in an external location
> Ensures that if one copy becomes lost or corrupted, the file can be restored using another - 4What is a Full Backup?> A backup that makes a copy of everything on the system onto backup media
> Extremely slow process that takes up a lot of space
> Very easy to restore a system from - 5What is an Incremental Backup?> Only the files that have changed since the last backup are copied
> Faster and use less space
> More difficult to restore a system from since the most recent full backup must be applied first, then each incremental backup in the correct order
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- Description
- A level Computer Science (Applications Generation) Flashcards on Data Compression & Backup, created by Malachy Moran-Tun on 05/12/2022.
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- Malachy Moran-Tun
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- Created by Malachy Moran-Tun · Nov 30, 2022
- Copied by Malachy Moran-Tun · Dec 5, 2022
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