Mac OS X 10.8 or later
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FreeFileSync for macOS imposes no artificial limitations on how many files you can sync. Practically speaking, the only limiting factor for extremely large sync jobs is the amount of free memory available: For each 1 GB of RAM, FreeFileSync can synchronize roughly 1.7 million file pairs at a time.
Note: Requires a 64-bit processor.
Also Available: Download FreeFileSync for Windows