Whatever you do Dave, DO NOT delete your original replays from your profile page thinking it is safe to do so because you have copied them, if you do you will lose the functionality of the copy as well. They can be deleted, but it has to be done a certain way to avoid losing the blog copy.
I have two videos which may help you to achieve what you want to do, the first shows how to post a replay to the forum, posting a replay to your blog is more or less the same so it should be okay for you.
The second video shows how to safely delete videos from the replays section of your profile page whilst allowing the blog copy to remain functional.
VIDEO 1
VIDEO 2
↓↓↓ EDIT : You're welcome Dave and thank you. ↓↓↓