Minecraft Realm XBox One: card still there after termination of the subscription?

I would like to know exactly how Minecraft Realm works regarding the map. I have no idea about something like that and would not like to make any mistakes because there are many hours in the card and it would therefore be a disaster if I lost the XD

Question 1) I have a huge map already created: can I use it for realm? Under settings for the card is: "Play on realm", but that means that I can play this card with a realm together with friends, right?

Question 2) Suppose I use Realm and play with others on my card, and at some point I don't want the subscription anymore… What happens to the card? Is it gone or does it end up on my XBoxOne again and could it continue to play as normal?

Yes, it is still there and can even be downloaded. The rest of the realm is no longer usable, i.e. Changing the name or description, uploading a new card, replacing it with a new natural card, and managing the members.