Sync preferences window features two tabs: General and Advanced. The latter one also contains power user settings.
1. Check for updates to this version
Forces Sync to check for a new version on startup. Also allows to check for updates manually at any moment.
2. Start Sync on startup.
Allows Sync to launch automatically when the System boots. This option is available for Mac and Windows only.
3. Show notifications.
Turns on/off notifications for approval requests, start/ending of syncing, etc.
4. Path to default folder location.
This is where folders will be created if the device is in mode Selective Sync or Synced. If you wish to change the it, click 'Change'.
Enables you to change Sync language.
6. Shows keyboard shortcuts.
7. Receiving and Sending rates
Allows you to limit the bandwidth used by Sync. By default the limits apply only to the internet connections, not to LAN. To force this limit in LAN, set option "rate_limit_local_peers" in power user preferences.
Lets you set up a weekly syncing schedule - put Sync on pause or limit sync speed on certain days and hours. See here for details.
9. Listening port
Allows you to configure the port Sync will be using for:
- Incoming and outgoing UDP packets
- Incoming TCP connections
If you do manual port forwarding on your NAT, you should forward incoming packets and connections to this port. Listening port is set to random value upon installation, but can be changed manually later.
10. Use UPnP port mapping
If checked, Sync will send UPnP and NAT-PMP packets to the router, trying to map ports automatically.
Note: some printers, scanners and other network equipment do not process UPnP packets correctly and may stop processing network requests. If this happens, try disabling UPnP for Sync (or for a particular network device, if possible).
11. Use Proxy Server
Starting from version 1.4 Sync supports proxy servers. Note: proxy servers prohibit incoming connections and allow only outgoing ones. It means that if you have 2 instances of Sync, both behind a proxy, they will be able to talk only via Relay sever. If you have only 1 instance of Sync running behind a proxy, it will manage to connect to other instances directly.
12. Show "Copy Key"
Adds a "Copy key" menu item in the folder context menu, which allows you to quickly copy a Key to clipboard without opening folder preferences.
13. Enable debug logging
Allows for extended recording of all events happening in BitTorrent Sync. Logs are used for issue analysis (support team will be very likely asking you for a debug log). This article describes how to enable debug logging on different platforms and where to find the log file itself.
14. Power user preferences
Gives more flexibility to configuring Sync. See here for details.