That is indeed a good idea. I think that's wise. But maybe it is better to start saving it so that you have more money later. And you can also invest more.
saving won't make you more money until you choose bitcoin to save. only bitcoin is a way where if you just save your money, it will increase after time to time.
but for me investment still better, saving in bitcoin increase your money but investment in right place increase your money far better than only saving.