I've already posted a similar thread elsewhere - and I know now that 2 solutions (three with a simple usb key) are available: ChronoSync & CCC. ChronoSync seems simple, but I've not bought it yet, so I can't judge. CCC is free but it seems rather complex to set up. Most of all, it seems that whatever the setup, we still have to sync the 2 macs manually after each use. In that case, it's not that different from using a simple USB key, to me. Or am I wrong? Are there other solutions? Would anyone care to share their experience?