the.com/backup

The thing you swear you have until the exact moment you need it.

means A copy of data or a substitute resource kept in reserve so you can recover or continue if the original fails.

from A straightforward compound of "back" (the Old English bæc, meaning the rear or behind) plus "up," giving the sense of moving backward or holding something in support. "Back up" as a verb — to support, reinforce, or stand behind — is the older idea; the noun "backup" condensed from it, picking up its data-and-recovery meaning in the 20th century alongside computing.

3-2-1 rule
Three copies, two media, one off-site, zero excuses
Schrödinger's file
Untested backups exist and don't until you restore
Pixar's scare
Toy Story 2 was nearly deleted, saved by home copy
Tape lives
Magnetic tape still backs up the world's data
Word origin
Borrowed from soldiers reinforcing the front line
for instance

backup dancers — performers like those behind beyoncé or the weeknd during major tours and performances

backup quarterback — player like joshua dobbs or tyler huntley waiting to replace starting qb in nfl

backup generator — diesel generator at hospitals like mount sinai that activates during power outages

backup vocals — harmonies provided by singers like phoebe snow on janis joplin's 'pearl' album

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