The burnup chart shows the total amount of work to be done and the total amount of work done. Project and development teams use the charts to monitor the progress of their project. Since it also shows the total amount of work to be done, the team can also track changes in the project scope and in the estimated amount of work.
On the y-axis the burnup chart shows the total amount of work (to be) done. On the x-axis the burnup chart shows the amount of time. Over time you see the work done line moving towards the total amount of work. The blue line shows the total amount of work to be done. When the blue line moves up it means the scope of the project has expanded. When it moves down, it means the scope of the project has been diminished. The orange line shows the amount of work finished. It should get closer to the blue line with time.
When to use the burnup chart?
The burnup chart is easy to use in any project, as long as you are able to estimate the amount of work with some accuracy.
When your estimates of your work are pretty accurate you can use the burnup chart in just about any project. When the scope, time frame and amount of work are well defined i would prefer the burndown chart. But when you can expect scope changes and longer timeframes the burnup chart can really help you. Especially during the sprint and the sprint retrospectives.