I added the staysail on my H410. Nothing in the factory manual which includes a page on the option shows running backstays, but I also read about them being needed. I went without.
The staysail is so much smaller, so easy and fun to use. It's still new to me but at 24knts true wind, going ddw wing on wing both poled out, no main it was pretty stress free to the mast besides the picture perfect sailing that day.
Plus i really don't want more running rigging complicating things if really not needed.