should not laugh but cant help it.
you are basically using your sky output like a live tv channel.
using your scart output (tv output for rgb)to record onto a dvd recorder as you used to with a vcr.no different.
not going to be in hd but you can archive any programme this way in the best possible way you are allowed to.
it works fine for stuff you want to keep and its better than vhs ever was.
I think I can add to that so HD can be recorded, use a HDMI to composite converter so that you have an analogue YPrPb (along with the audio) going to an external PVR that can record an analogue HD this way.