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red75 comments on MWI, copies and probability - Less Wrong
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Can I sum it as: if you know that "backup copies" exist then it's OK to risk being exploded? Do you care for being backed up in all Everett branches then? Or is it enough to backup in branch where grenade explodes?
The usual idea of a "backup" is that it can be used to restore from if the "original" is lost or damaged. Everett worlds are not "backups" in that sense of the word. If a quantum grenade kills someone, their grieving wife and daughters are not consoled much by the fact that - in other Everett worlds - the bomb did not go off. The supposed "backups" are inaccessible to them.
Kirk and Scotty would say yes.