How to do full local backup? and after that how to restore from local back up?

Can you elaborate your needs? Or do you need to convert your data from QB Online to another accounting app? 

Hello Noam-dortech-co-, 

Welcome to the Community page, 

If you are on our new product advanced you can do this, this article tells you more however if you are not and you're on one of our old products you would have to export the data out and save it on to your pc/laptop as a backup for yourself.