Understand binding as a reference
Handsontable binds to your data source (list of arrays or list of objects) by reference. Therefore, all the data entered in the grid will alter the original data source. If you have to avoid that, copy the data before you pass it to the grid. To change the data from outside Handsontable you can use our API methods, f.e. a change being made will be displayed immediately on the screen after calling setDataAtCell method.
Working with copy of data
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.