Questions about database limitations, backup

Hi all,

I am developping apps but now i have questions about database, backup …
I create more and more database for attendees user, for news, for chat …
But i read that te limit is 20G and i can purchase more but the question is : Where i can check the all database size or each database size ?

And what about the backup, how it works ?

And when i publish apps to app store for example, if i add a new entry in database for news for example, the relation is updated ? i dont need to publish each time ? normally no :stuck_out_tongue:

Thanks for all