Understand binding as a reference
Handsontable binds to your data source (array or object) by reference. Therefore, all the data entered in the grid will alter the original data source. In complex applications, you may have a purpose to change data source from outside of Handsontable. A changed being made will not be presented on the screen unless you refresh the grid on the screen using the render method.
Change data without rendering changes
In case you want to keep a separate working copy of data for Handsontable, it is suggested
to clone the data source before loading it into Handsontable. This can be done with
JSON.parse(JSON.stringify(data)) or another deep-cloning function.
Clone data before saving it
In a similar way, you may find it useful to clone data before saving it. That would be useful to make programmatic changes that would be saved to the server but kept invisible to the user.