A backup is a copy of important data that is stored on an alternative location, so it can be recovered if deleted or it becomes corrupted. Depending on how often the data changes, how valuable it is, and how long it takes to back up determines how often a backup is run.
For example, a company with customer records that change frequently may back up their data every few hours. Even more sensitive data such as bank records may be stored on RAID drives that help protect the data even if a drive fails.
Today, there are dozens of different ways to back up your information and mediums to keep your data. For example, CD-R, DVD-R, USB thumb drives, external drives, and in the cloud are some of the most popular places to backup your data.
Why should I back up my data?
A computer could stop working at any time and data on a hard drive could become corrupted or lost if the hard drive fails. When hardware or the computer stops working, data on the computer could be lost. Any files that are important to you should be backed up to prevent loss of data and ensure you can recover those files if needed.
Should I use "backup" or "back up" in my writing?
Both forms of the word are correct. However, when using the word as a noun or adjective, it should be one word, and when being used as a verb, it should be two words. Below is an example of how both forms of the word could be used.
Make sure to back up your important data and store it somewhere safe. If your important data is deleted or lost, you can restore it from the backup.