RsyncOSX is a GUI frontend for the rsync command-line tool
Before installing and using RsyncOSX there are some important information to read and understand. The first document is how to get and install RsyncOSX. The second document is some information what RsyncOSX is and how to use the application. Please read the second document before using RsyncOSX.
Rsync is a file-based synchronization and backup tool. There is no custom solution for the backup archive. You can quit utilizing RsyncOSX (and rsync) at any time and still have access to all synchronized files. Be sure you understand the basics how rsync works before using RsyncOSX. There are also a changelog and some info about signing and notarizing of RsyncOSX.
RsyncOSX is also released as RsyncGUI on Apple Mac App Store. RsyncGUI only utilize the stock version of rsync in macOS. Because of that the snapshots feature not available in RsyncGUI. Neither is scheduled backups.