Indeed, they've run afoul of this before when mirroring sites, often niche ones that notice the uptick in traffic and whose users are attentive to their content

Indeed, they've run afoul of this before when mirroring sites, often niche ones that notice the uptick in traffic and whose users are attentive to their content rights. It's an interesting conflict -- there is a benefit to saving things in case of site failure, but simultaneously it is a problem on a copyright basis, particularly for written works where the author themselves feels small next to the Internet Archive. They've walked a fine, fine line with various items like DOS abandonware games where the owners are potentially in more of a position to "lawyer up."