You can now review your project's history on the new History page available from the top-right menu.
You can do all sorts of things there:
view history of a particular Asset or Transaction - every object now has a History in their context menu, or you can click the loupe in the history
search history to find when a specific value was entered
expand the change to see which properties where modified
revert the whole project to any previous point in time
delete changes you don't need anymore or ones that are causing trouble
export selected changes and import them to another project
Read more on how to use it