I would like to network three computers to backup to a single external harddrive with eSata connection. The 500 GB Western Digital External My Home Book Edition HD has USB, Firewire 1394a, and eSata. I want to use eSata if possible due to faster speed. Is this possible? Can I use a Router with eSata connection? And what software would you suggest? Want to access the HD at different times for each computer overnite to do incremental backup. Thanks.