Billing Upgrading downgrading losing work

[John Johnson]

I'm currently in my trial period using the Premium Trello.

If the trial period expires and I haven't upgraded will I lose any of my work?  For instance, if a feature becomes locked or if I lose a feature, will upgrading to premium bring back my work or will it be lost forever? 

Hope this makes sense and thanks in advance for your help. 

[John Johnson]

Deleted my question because it's a duplicate but you didn't send a link that answers the question?  

So, if it's a duplicate question where is the answer?!