backup ( backups plural ) , back-up
1 n-var Backup consists of extra equipment, resources, or people that you can get help or support from if necessary.
There is no emergency back-up immediately available..., Alternative treatments can provide a useful back-up to conventional treatment.
2 n-var If you have something such as a second piece of equipment or set of plans as backup, you have arranged for them to be available for use in case the first one does not work.
Every part of the system has a backup..., Computer users should make regular back-up copies of their work.
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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"