back-up

In information technology, backup refers to making copies of data so that these additional copies may be used to restore the original after a data loss event. These additional copies are typically called "backups." Backups are useful primarily for two purposes. The first is to restore a computer to an operational state following a disaster (called disaster recovery). The second is to restore small numbers of files after they have been accidentally deleted or corrupted. Backups are typically that last line of defense against data loss, and consequently the least granular and the least convenient to use.
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(1) When bond yields rise and prices fall, the market is said to back-up. (2) When an investor swaps out of one security into another of shorter current maturity, he/she is said to back up.

In cartography, an image printed on the reverse side of a map sheet already printed on one side. Also the printing of such images. 1/2/73

En cartographie, image imprimée au verso d'une carte déjà imprimée au recto. Désigne également l'impression de ces images. 1/2/73

saving information on a computer disk Don't forget to make a back-up disk of all your computer files.

To hold one section of an object such as pipe while another section is being screwed into or out of it
  

The person who holds one length of pipe while another length is being screwed into or out of it