The most powerful feature of modern archives is their compatibility with 4chan's own URL structure. If you have a link to a thread on boards.4channel.org , you can often simply change the domain to desuarchive.org or warosu.org to view an archived version, if one exists. For example, boards.4channel.org/a/thread/12345678 can become desuarchive.org/a/thread/12345678 . This makes cross-referencing and finding older content incredibly easy. Many browser extensions like 4chan-X also rely on this functionality to provide a seamless archival experience.
Focused solely on preserving the sheer volume of content from the random board. 4. Warosu.org (Specialized Archiver) 4chan archives list