Active Backup for Business Agent
Windows 64bit (as of April 28, 2024) - the most popular download I have
https://global.synologydownload.com/download/Utility/ActiveBackupBusinessAgent/2.6.2-3081/Windows/x86_64/Synology%20Active%20Backup%20for%20Business%20Agent-2.6.2-3081-x64.msi