@KacperMarcisz I have used this myself but had forgotten at the time of my post. I think what would enhance this feature would be the ability for syncing local and online therefore offline changes would automatically keep the online copies in sync.
Let it be known, I love the online saving of Easel and Pro, it gives me peace of mind knowing system failure at home wont lose my projects. And with the ability to download the zip, that is good insurance (although sometimes forgotten) incase there were some unforeseen issues on Inventables end.