Library of Congress has some well considered recommendations for archival. https://www.loc.gov/preservation/resources/rfs/TOC.html https://www.loc.gov/preservat

Library of Congress has some well considered recommendations for archival. https://www.loc.gov/preservation/resources/rfs/TOC.html https://www.loc.gov/preservation/resources/rfs/TOC.html For web content they recommend gzipped WARC. This is great for retaining the content, but isn’t easy to search or render. I do WARC dumps then convert those to ZIM for easier access.