[CentOS] vim and backup files

Fri Apr 30 19:13:16 UTC 2010
Joseph L. Casale <jcasale at activenetwerx.com>

None of my CentOS servers that are up to date recognize :set backup?
A strace shows no mention of it, the backup never gets created, what
am I missing here, anyone know if something changed that affects the
backup behavior?