When you restore your chat history data from a Samsung Galaxy S7 to a bq Aquaris E, the existing chat history on the Aquaris E will be overwritten. This means that you will lose all of the chat history that you have on the Aquaris E.
If you want to keep your existing chat history on the Aquaris E, you will need to export it before you restore your chat history data from the Galaxy S7. You can export your chat history from the Aquaris E by going to Settings > Chat > Export chat history. Once you have exported your chat history, you can save it to a file on your computer or a cloud storage service.
After you have restored your chat history data from the Galaxy S7, you can import your exported chat history back into the Aquaris E. To import your chat history, go to Settings > Chat > Import chat history.