I recently changed MBPs and restored from Time Machine. Now I want to continue using the backup disk with about 6 months worth of backups on, but it wants to start again saying that there's not enough space for the initial backup. I can't see any way around this in the TM help, but I don't want to start afresh and delete all those old backups. Surely there's a way of making Time Machine think the computer is the old one? Would be most grateful of any advice.