> I looked at patchmode before, but it doesn't do what I want. patchmode only
> keeps the oldest version of the file. So it will save the backup after the
> first write. However, if you kill the buffer and then visit the file again,
> a new backup file will not be made.
>
> I want a new backup file only when I first open up a file in a buffer and
> save it the first time. But after I close the buffer and reopen it again
> later, I want it to write another backup.
>
Ah, I missed that part. Since it almost does it, how about using it
with a BufRead autocmd which sets a flag (like b:needs_backup),
coupled with a BufWritePre autocmd which deletes the backup file if
b:needs_backup is set?
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