If you want to back up an "image" of the complete physical drive as a single entity, then dd(1) of the "c" partition is needed. This will back up every block on disk, used or unused.
If you want to back up individual FFS partitions for possible restoration on OpenBSD, dump(8) is recommended. If you intend on restoring to non-OpenBSD environments, tar(1), cpio(1), and pax(1) all have various capabilities. There's also the gtar package, which is the GNU implementation of tar(1).
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