There are some general information which might be nice to know.
1 - Latest version of rsync
The default /usr/bin/rsync on macOS Sonoma and macOS Sequoia differ in their versions. Both versions adhere to protocol 29 of version 2.6.9, but the licenses for these versions are distinct. Additionally, there may be variations in the code.
In macOS Sonoma, the default version is version 2.6.9, released in November 2006. In macOS Sequoia, the default version is a compatible rsync based on the BSD license. The command /usr/bin/rsync --version in macOS Sequoia displays openrsync: protocol version 29, rsync version 2.6.9 compatible.
It is recommended to install the latest release of rsync by Homebrew. Install the latest version by command:
brew install rsync
In RsyncUI, navigate to the settings menu and select Rsync and path. If rsync is installed via Homebrew, simply tick the boxes for Rsync ver3.x and ensure that RsyncUI correctly sets the path for rsync.
Note: RsyncUI supports snapshots of files. However, due to a bug in version 2.6.9 of rsync, the snapshot feature in RsyncUI requires the installation of the latest version of rsync.
2 - MIT License
The MIT License (MIT), also read about the MIT Licence (https://en.wikipedia.org/wiki/MIT_License) at Wkipedia.
Copyright (c) 2020 - 2025 - Thomas Evensen
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without restriction,
including without limitation the rights to use, copy, modify, merge,
publish, distribute, sublicense, and/or sell copies of the Software,
and to permit persons to whom the Software is furnished to do so, subject
to the following conditions:
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
3 - RsyncUI files, JSON
RsyncUI read and store configurations, log records and user settings as JSON (https://en.wikipedia.org/wiki/JSON) files. The location of files is: $HOME/.rsyncosx/macserialnumber. RsyncUI get the computer mac serial number at startup. At startup RsyncUI reads the user settings and default configurations from JSON data. Log records are only loaded when viewing logs and when updating the logs after a synchronization task.
Configuration files
$HOME/.rsyncosx/macserialnumber/configurations.json
If profile is utilized:
$HOME/.rsyncosx/macserialnumber/profile/configurations.json
Log records
$HOME/.rsyncosx/macserialnumber/<profile>/logrecords.json
User settings
The user settings are stored as:
$HOME/.rsyncosx/macserialnumber/rsyncuiconfig.json
The user settings applies to all profiles.
The logfile
The logfile is a text file and normally view within RsyncUI.
$HOME/.rsyncosx/macserialnumber/rsyncui.txt
4 - Signing and notarization
RsyncUI is digitally signed with my Apple Developer Certificate and notarized (https://support.apple.com/en-us/HT202491) by Apple. This verification process ensures that the application is free from malicious code and will seamlessly integrate with Apple’s Gatekeeper technology. Upon opening either a new or updated application for the first time, Apple will issue a notification.