Accidentally saved something you didn't mean to? Need to go back 'cause your annoying friend added something you didn't like? Check this out:
Go to your profile page and click on the dot-dot-dot menu next to the project you want to go back in and look for the "Pervious versions" option. (1) There you have previous versions of your project ready to load! (2)
(1) Click the dot-dot-dot menu next to the project you want to explore previous versions of.
(2) Click "Previous versions" to open up the Time Restore dialog. Here you will see previously saved versions of your project!