My cloud ex2 vs my cloud ex2 ultra vs my cloud mirror

Sorry everyone, before proceeding with the purchases, I wanted to understand what are the differences between these 3 products? you can help me.
Thank you

My purpose is to use at home, file sharing, documents etc.
But I would also like some discs that can be replaced in case of future

The MyCloud Mirror and MyCloud EX2 are basically the same (same firmware). The MyCloud EX2 ultra is 5 years newer (a little faster) and basically the same as the MyCloud Mirror Gen2.

I think the only one you can buy now is the EX2 ultra.