Backups not created

With an empty .vimrc or one with just "set backup" in it, or
typing :set backup, I can't get a backup file created on any
of my CentOS 5 servers. It used to work and has recently stopped
on all of them?

A strace on a remote hosting chroot running an older version of Centos
shows it working as expected but on any of my servers it never
attempts
a write of the file anywhere?

Anyone know how to debug this?

Thanks!

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