The OpenBSD FAQ instructs you to untar a fileset from the root directory, not elsewhere and moving. Either follow the instructions explicitly, or use tar with "-C /". You must be root and use -p, as uid:gid and filemode settings are required to be retained.
I'm not an rsync user, and cannot comment on that methodology. But if you follow the FAQ rather than defining your own methods, you will not get into any trouble.
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