Vim allows you to go to an earlier text state for a buffer with
:earlier. For instance, if you want to see the state of the buffer from 10
minutes ago:
:earlier 10m
Similarly, you can move back toward the present text state of the buffer
with :later. If 10 minutes earlier was too far, you can come back 5
minutes like so:
:later 5m
I encountered these in Nick Nisi's 'Vim + Tmux' talk.