What is backup?

Connect his network to more component

Copy to save a data from original source to other destination

Filter an old data from new data

Access data from tape

A backup is a copy of one or more files created as an alternate in case the original data is lost or becomes unusable.
For example, you may save several copies of a research paper on your hard drive as backup files in case you decide to use a previous revision.
Better yet, you could save the backups to a USB flash disk, which would also protect the files if the hard drive failed.

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