I am a member of the public who has stumbled into discovering potential corruption of public funds. What are your tips/best practices for preserving government web pages and documents before filing public records requests and revealing info during public meetings? (California)

Hi all, I am not a professional and have stumbled into a situation uncovering grift. Apologies as this straddles cybersecurity along with forensics and I have tried posting in both. I am hoping someone may be able to sha