csync2, perhaps? (Score 1)

DRBD is for high-availability clusters with sub-minute failover and synchronous replication. It is not suitable for server-to-desktop file replication, let alone two-way. The DRBD link in the post is horribly outdated; current information about DRBD is available from http://www.linbit.com/. Or from my blog, for that matter. :-)

rsync has some painful deficiencies when it comes to lots of files being synced on a frequent basis. Csync2 (http://oss.linbit.com/csync2) addresses some of those; it may be more useful for the usage scenario described.

Disclosure: I work for LINBIT, the company behind DRBD. Csync2 was written and is being maintained by a former employee of ours.