savevers script not saving numbered backups

I'm running the savevers script
(http://www.vim.org/scripts/script.php?script_id=89) but I'm not
getting the expected numbered backups. These are the only backup
related commands in my .vimrc:

set backupdir=$HOME/.backups
set savevers_types='*'
set savevers_max=9999
set savevers_purge=1
set savevers_dirs=&backupdir
set patchmode=.bu

In fact, I am getting no backups at all!

$HOME shows as /Users/Chris -- which is as expected. I have the
directory /Users/Chris/.backups created but it remains empty.

Any idea how to troubleshoot this?

c
--
Chris Lott

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