What are card revisions?
The card revisions functionality saves a new card revision every time a card is updated. This is useful for value changes that are recorded as a historical event but the old value is not always preserved in the History tab. Most commonly, this feature is used to see how and when the card's description has changed.
It allows for every given change in a card to be recorded and provides the ability to restore the previous state. This provides a safety net when multiple people work on a card at the same time, or simply a way to track the progress on a given card through the revisions.
Where to access the card revisions from?
In order to access a card’s revisions, a user must have a board role that allows them to open the card details and edit them.
You can find each card's revisions in the three-dot menu in the top right corner.
How to restore a card to a previous revision?
When you click on the rescission button, a list of all the Card Versions. After selecting the version you want to look at the following window will appear that details the properties of that card in the selected version.
You can either restore all the card fields to the version or you can deselect irrelevant ones.
Note: the card attachments, watchers, and position cannot be restored to a previous revision. Custom fields will be merged.