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Flashcards by Malachy Moran-Tun, updated more than 1 year ago
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| Question | Answer |
| What 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 |
| What 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 |
| What 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 |
| What 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 |
| What 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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