Do I need to retain records of my website's contents?
The short answer: Yes, for a minimum of 2 years to meet Reg. DD TISA requirements
The Federal Financial Institutions Examination Council (FFIEC) states:
Record retention provisions apply to electronic delivery of disclosures to the same extent required for non-electronic delivery of information. For example, if the web site contains an advertisement, the same record retention provisions that apply to paper-based or other types of advertisements apply1. Copies of such advertisements should be retained for the time period set out in the relevant regulation. Retention of electronic copies is acceptable.
From Guidance on Electronic Financial Services and Consumer Compliance
1 AdvisX Risk Management's Record Retention Schedule for Banks states that copies of advertisements must be retained for 2 years.