My question is: Is it ok to do this? Im assuming theymos wouldn't care.
In the event that this affects the site's overall performance, theymos will most likely care.
I would like to ask, how big is this website? just to see how long it would take to have an offline database. This site is mostly text, so it shouldn't be a lot, however, there's lots of text, and all images from external url's would be saved too.
Based on LoyceV's
information from two years ago, the required storage space for the entire bitcointalk forum is probably somewhere around 60GB, at the moment.
I just wouldn't like to wake up some day and see the site is gone for some reason. There's a lot of stuff to read in here that has been written for 10 year already, so it would be difficult to catch up. Just reading all of satoshi's posts would take a while. And I like to read things from source, so I guarantee nothing was modified. I've seen satoshi misquoted or even modified posts with inspect element.
Two very good archives of bitcointalk posts already exist: LoycV's
Loyce.Club and TryNinja's
Ninjastic.space. I think you can trust their authenticity.