A number of sites are collecting datasets and websites that have been deleted from gov. websites.
CDC datasets uploaded before January 28th, 2025
https://archive.org/details/20250128-cdc-datasets
U.S. Government websites
Preserving Public U.S. Federal Data
https://lil.law.harvard.edu/blog/2025/01/30/preserving-public-u-s-federal-data
The January 6th Multimedia Archive