Archive.is is described as '(previously named archive.today) allows you to "take a photo" of a webpage that will always be available even if the original page changes or is deleted' and is a popular website in the Backup & Sync category. There are more than 10 alternatives to Archive.is, not only websites but also apps for a variety of platforms, including Self-Hosted solutions, Mac, Windows and Linux. The best alternative is Wayback Machine, which is free. Other great sites and apps similar to Archive.is are ArchiveBox (Free, Open Source), Archive.st (Free), Archive-It (Free) and TechRewind (Free).
Social Feed Manager is open source software for libraries, archives, cultural heritage institutions and research organizations. It empowers those communities’ researchers, faculty, students, and archivists to define and create collections of data from social media platforms.
Captures screenshots, downloads source code, and monitors DNS records helping you keep track of changes on your websites without needing to restore from a backup. Think of it like the Wayback Machine on steroids.