@lilianangelia - My guess would be no, the files would not be deleted. However, I am only a volunteer moderator of this forum and not an employee of Miro, so I have no way of validating this assumption. 

I would suggest that you create a Miro support ticket. You can find a link to the support form by searching for "contact form" on the following help center article:

https://help.miro.com/hc/en-us/articles/360020185799-How-to-contact-Miro-Support