You can save/download your Portfolio Tracking, Watchlist, and Stock Research Pages via CSV file. This will let you keep local copies overtime and do custom analysis with the data.
Portfolio Tracking & Watchlist Page
In the action bar, click the "Download as CSV" button.
This is found on the following Portfolio Tracking tabs:
-Portfolio Overview
-Dividend Insights
-Dividend History
-Activity
It is also available on the Watchlist Page.
Here is an example pop up. Click the green "Download as CSV" button. This will save your CSV file.
Stock Research
Grey "Download as CSV" button. Found at the bottom of every table.
It is available on the following Stock Research tabs:
-Financial Statements
-Key Financials
-Dividends
-Shares Outstanding
-Price Ratios
-Other Ratios
-Stock Splits
-Peers