I understand the paranoia but what can be done about it..
Nothing.
So you find a missing post.
How do you move it. No way.
It has been ages since I used classic.
But I do recall in permissions to set it to read only.
read this post
https://www.ubbcentral.com/support/docs/ubbclassic/UBB6all.html

somewhere it talks about archives. which is what you want.

Blue Man Group
There is no such thing as stupid questions. Just stupid answers