- noun (written as back up)a copy of a file or set of data kept for security against errors in the original or master copy
- To copy computer files onto an additional storage medium. For instance, copying the contents of a folder contained on a hard drive to a tape drive or floppy disks. This is important, for instance, in avoiding the loss of data when there are software or hardware malfunctions, or in case of user carelessness. There are utilities which can simplify this process, for instance, by following a schedule, or by compressing the data to economize storage space and time.
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