You can either restore it or attach it. Make sure to set the compatibility mode to 90, reindex all the tables/ update stats on all the tables . Detach/Attach is like cut/paste. You detach from your source server and attach it to the target server. so, at anytime you are working on the same file. In backup/restore your db will still exist on the source server. So you will end up with the db on the source as well as destination server.
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