No specific info about version 3.3. Please visit the main page of Backup and Sync on Mac Informer.
Info updated on:
Automatically back up your data to your Dropbox account.
Handy tool for synchronizing and backing up data.
It helps you back up any folder into a single disk image archive.
Tune Backup provides a easy-to-use backup solution for your iTunes library.
In order to make a backup, "Touchwriter Sync" software is required.