Vista uses NTFS. OpenBSD's NTFS driver has been in "experimental" state for years -- it is limited to read/only access, and requires a custom kernel. Even with the driver configured, OpenBSD is not usable for backup/restore of NTFS data. Of course, dd(1) is an option, but it is a sector-by-sector copy of an entire partition, or, of an entire disk.
For NTFS backup, I prefer the ntfsclone utility, from the Linux-NTFS project. It will back up and restore an NTFS partition, copying only the saved data. This requires a different OS, of course. I have seen reference to ports of their toolset to FreeBSD, but I use a liveCD of Puppy Linux to run ntfsclone on Windows workstations, both WXP and Vista.
You would also want to back up the partition table; that can be done from OpenBSD's fdisk(8).
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