SlackBuildsOrg/network/btsync

BitTorrent Sync easily moves anything, anywhere - all the benefits of the cloud,
none of the limitations. Available for Windows, Mac, Linux, iOS, and Android.

To start automatic at boot make /etc/rc.d/rc.btsync executable:
chmod +x /etc/rc.d/rc.btsync
and add it to /etc/rc.d/rc.local
btsync will then be started as root using /etc/btsync.conf as config.

Use your browser to configure btsync: http://ip.address:8888/