History View

You can access autosaved versions of the configurations. This is useful when a lot of changes have been made and it is necessary to roll things back a little. 
Reactor will autosave the configurations every time a change is detected. These are accessible from the History View page. To find it you can write /history-view after the IP of the Blue Pill device. Another way of entering the History View is through the 'going back in time' icon placed in various parts of reactor. 

How long back can I go?
Every change from the last 24 hours is saved. After that it will be combined to 1 file per day, and saved for 10 days.
It is also possible to add tags to individual versions. When a tag is added to the version, it will no longer be deleted based on the default time scale and will persist.

What is being saved?
It's important to remember that these autosaved versions are only saving information from the Configuration tab. Although if you change things related to configurations, from the Home tab, it may also be saved, and therefore revertible from the History View.

Example: Adding a Panel on the Home tab will not be part of an autosave, but choosing a configuration for it will. 

How to find the History View
You can always type /history-view after the IP.

Here is the ways to navigate through the UI:

First way

Being in the Configuration tab, the icon can be found right beside the Undo/Redo buttons