autsync

import os

# Place this in a cron job for say every 2 minutes. To script this use
# crontab -l | { cat; echo "0 0 0 0 0 some entry"; } | crontab -

# You may also want to run ntpd on all clients to keep the time in sync.

# Array of locations of local and remote locations. I recommend mounting remote folders in
# Example (('/home/user/Documents', '/remotehostname/somefolder'),)
sync_locations = (
    ("/home/david/local", "/home/david/server"),
)
# Check if host is up
check_host = "localhost"

# Only allow this program to run once!
try:
    import socket
    s = socket.socket()
    host = socket.gethostname()
    port = 35636    #make sure this port is not used on this system
    s.bind((host, port))
except:
    exit()
if not os.path.exists(os.getenv("HOME") + '/.unison_backup'):
    os.mkdir(os.getenv("HOME") + '/.unison_backup')

if os.path.exists(sync_locations[0][0]) and 0 == os.system('ping -c 1 ' + check_host):
    if not os.path.isfile(os.getenv("HOME") + "/.unison_backup/first_sync_complete"):
        os.system('notify-send "Unison Backup" "Starting Initial Sync. You will be notified when finished."')
        for sync_location in sync_locations:
            exit_code = os.system('rsync -r ' + sync_location[1] + "/ " + sync_location[0])
            if exit_code != 0:
                os.system('notify-send "Could not sync!"')
                exit()
        open(os.getenv("HOME") + '/.unison_backup/first_sync_complete', 'w').close()
        os.system('notify-send "Unison Backup" "Initial Sync Complete"')

    # Run Unison
    for sync_location in sync_locations:
        os.system('unison %s %s -batch -prefer newer -times=true' % (sync_location[0], sync_location[1]))