Hacking About Save on O3DS with GW?

[Fatalanus]

Hi guys.
So I have a O3DS and I want to do backups of my retails games.
Ofc I played 'a lot) on them and I wanted to know if:
- my saves will be gone after gowngrading my O3DS with GW? Or basically what will be gone?
- I'll be able to transfer the saves from the original games to the backup?
- If i stay in normal mode (no GW mode) if I can play my retail games with the old save.

I couldn't find those answers in the GW guide... Thank you for your help, guys!!!
Good luck with OOT 3D. -__-'

 

[Fatalanus]

Anyone can help me?
I've found the link on the GW guide:

From the Gateway Menu, select "Format EmuNAND" -- this will ERASE THE SD CARD INSIDE YOUR 3DS/2DS -- INCLUDING YOUR GAME SAVES AND DLC and configure it for EmuNAND use.
It'll erase all the saveof my retail games? Or the ones I have bough from the Eshop?