Backup:An extra copy of a document, file or program.
Explanation:
You should make backups of all important work. A backup of a file on the hard drive can be saved on a floppy or zip disk. A backup of a floppy disk file can be on the hard drive or another floppy or zip disk.
Sentence:
"Don't forget to make a backup of your book report!"
Assignment: continue Internet Safety Assignment
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