Copy / rip thread from outside forum add on?

[phsycical]

Hello, this might be a bit of a long shot, but is there any sort of add on that can rip / copy threads from forums that you don't own to forums you do own? There's a lot of cool content online that I'm worried won't be around forever, and I'd like a way to preserve and organize it.

Timestamps, messages, posts etc. would just be copied and generated. Accounts would probably be generated as well, including avatars, join date, signature, etc. Usernames would be the big issue. The accounts would still be generated, there would just have to be a check in order to ensure that the usernames didn't conflict with any of the usernames already on the board. For example, if "Joe" already existed, then it'd need to generate "Joe_1", "then "Joe_2", etc. similar to what happens if you try to download a file with the same name as one you already have. The accounts' private information such as email obviously couldn't be copied, but that's not really important for this.

Does any add on like this already exist? If not would it be possible to create one?