Because BeastForum dealt with controversial content, many "free archives" are actually malware honeypots. A truly high-quality archive is one that has been scanned, cleaned, and verified by a second party (e.g., a data hoarder collective or an academic institution).
Often maintained by former members of the community to keep the spirit of the forum alive. beastforum archive high quality
Modern archives often strip malicious scripts from old web data to ensure safe browsing. Technical Methods for High-Quality Retrieval Because BeastForum dealt with controversial content