The ArchiveTeam has the ArchiveTeamWarrior project which is a small virtual machine or Docker instance that will help index and archive various sites based on need. For instance a big focus is on Reddit right now before the API access gets pulled or too many sites go dark permanently. This tool uses spare bandwidth from multiple locations (everyone running the tool) to not hit IP blocks due to rate limits or other issues that occur when trying to access as much of the site as possible.
Archive team is not affiliated with the Internet Archive (Archive.org) although Archive.org hosts the content. This is then made available via The Wayback Machine.
I don’t think so. I’ve been trying to find a tool to export as much of a site as possible but haven’t found that yet. Bulk Downloader For Reddit, or BDFR might do the tick but I don’t have an instance running yet to see.