I've multiple macs at office and home. I would like to keep my main documents synced between them. My main routine is , do some work at home then take those files and continue working at office and then may be continue working at home again later on. I know I can have external hard disk and work off of it, but i would like to keep copy on office and home computer, that helps to me to continue working incase I don't have my external with me. This also becomes my backup so I always have updated backup at 2 places (office and home). What applications would you suggest to keep everything in Sync ? Superduper! ? ChronoSync ? How do they perform ?