In the 1980’s we had one (OS/VMS) job that ran each month specifically to collect data for the IRS (actually taking skimmed data and creating the IRS tape). Which was totally understandable since we were a bank.
And we always kept 7 years of backup data. And that was just us (I think it was a law).
Given how cheap storage is these days, some of that data is going to be out there until Jesus Returns.