The 1.5 version of aRsyncGUI for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. ARsyncGUI for Mac is included in System Tools. This free software for Mac OS X was originally created by Thomas Evensen.
From the developer:
aRsyncGUI is a GUI for the rsync command-line tool. The main uses are to backup (and restore) local files on Mac to local storage (attached disks) and to backup (and restore) local files on Mac to remote servers connected to Internet or local network. The main objective of this app is to keep any source directory and backup directory in sync.
You may want to check out more software for Mac, such as AVerVision, Tri-BACKUP 404 OS X or FatMac Backup, which might be similar to aRsyncGUI.