Budget for Europe?

Hey everyone! First of all I would just like to say congratulations to Christianne, this website is amazing!

At the moment I am planning a 1 month backpacking trip around Europe for after Covid and I was wondering, how much would be a good budget? I am planning on visiting Italy, Switzerland, Austria and a couple of other places. They're not the cheapest countries, I know, but I will be staying in hostels, cooking my food, doing loads of free things. Any help is greatly appreciated as this is my first time doing something like this😊 Thank you!

-Claudia