[quote]1. If I disable cross save, do I lose all of my items in my collections and in my vault? or do they just remain available on the original platform I obtained them on, would I be able to access my current vault (with my cross save data from my PS4) on my Xbox once it's disabled?[/quote] All of your items in collections/vault are tied to your original account (the one that you cross saved from). If you deactivate cross save, you will "lose" these items on every account but the original. [quote]2. I understand that I would no longer have access to my current characters and any gear/items/cosmetics/ect... on those characters but would I also lose access to my glimmer/legendary shards/collections/vault?[/quote] Yes, you will lose these as well. More information on this can be found in the [url=https://help.bungie.net/hc/en-us/articles/360049498031-Destiny-2-Cross-Save-Guide]Cross Save Guide[/url].