CyberCiti is a popular Linux-related blog that is at least a decade old, which contains comprehensive guides on a wide varity of commands and software.
Its exclusion from the Wayback Machine puts the entire site history at risk should it shut down in future. Deletion of articles likely causes unrecoverable dead links from other sites such as internet forums.
This should be kept in mind when linking to guides on CyberCiti. If possible, search an alternative or create a guide on an archive-friendly site like Wikiversity.