GSC data loss calculator
This GSC data loss calculator answers one question: when does Google delete the Search Console data from a month you care about? The answer is always the same formula, that month plus 16, but seeing the date attached to your own baseline tends to change how urgent it feels.
The window is rolling, so this isn't a one-time event you can put in a calendar and forget. Google deletes a day of your history every day. Whatever your oldest surviving month is right now, it's the next to go.
Nothing recovers data that has already left the window. For the months still inside it, an archive works: Month17 backs up whatever Search Console still holds the day you connect, then syncs daily and keeps every row, with the whole history queryable from Claude or Cursor over MCP.