Linus Tech Tips is making a data storage server for Dream, containing over a hundred terabytes of SSDs and a petabyte of mechanical drives. I don't know any reason why he would need this much storage for anything, since the most likely reason, archiving VODs and video recordings, would take a fraction of this given how little he streams and uploads. For comparison, LTT has their own storage setup in the petabytes, but they're storing raw 8K RED footage, upload daily, and have been on YouTube longer than Dream. (
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It's worth pointing out that when LTT does these kinds of server builds for themselves, they're usually sponsored by the companies that provide the drives/servers. They've also done other storage server builds for YouTubers such as the Slow Mo Guys and Smarter Every Day, but those are 10% the size of this one and are only HDDs. I don't know if this is sponsored or if Dream paid for it.