Editor autosave now supports Wix Code changes as well.
What does it mean?
It means that adding collections, adding columns to collections, adding files and changing the code will be periodically and automatically saved as part of the site.
In addition, changes and additions to collections (schema changes) which are made by applications such as Form Builder are also going to be autosaved.
You can always Disable/Enable autosave by using this KB shortcut:
PC: Ctrl + Shift+A