Charts are kept in memory as long as the project remains open, even if you close the Chart viewer. You can reopen an existing chart by using the Chart Manager.
The settings for each chart that you create while the project is open are saved in the project file (.gpr) when you save the project. The data itself, however, is not saved with the chart. The chart only contains a reference to the data. If you make changes to the layer's attributes, the chart will reflect the changes in the data the next time you open it, but the design of the chart will remain unchanged. If you close the project without saving it, the charts in memory are discarded along with any other changes in the project file.
You can also export your chart as a graphic in one of several file formats.
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