Is there some means of saving your Messages history on OS X and copying it to a new system without doing a full restore from a Time Machine back up?
Doing some searching, I found the below and tried this approach in a virtual machine copy of Mavericks without much luck.
Despite copying the files to their respective locations on the fresh install and adjusting permissions, the new installation version of Messages never seems to import/recognize the history from my current system.
To ensure my permissions were okay, I also found
which was linked to by
but this also did not result in Messages importing/using the copied history. Both instances of Mavericks are using Messages 8.0