When comparing rsync vs Sync, the Slant community recommends rsync for most people. In the question“What are the best personal file-syncing solutions?” rsync is ranked 2nd while Sync is ranked 10th. The most important reason people chose rsync is:
Only the changed parts of files are synced. For instance, if a long log file increases by just a few lines of text, a small diff will be sent to and saved in the archive. Rsync also compresses data in transit.
Specs
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Pros
Pro Fast and bandwidth efficient
Only the changed parts of files are synced. For instance, if a long log file increases by just a few lines of text, a small diff will be sent to and saved in the archive. Rsync also compresses data in transit.
Pro Works over SSH
SSH support allows sending files securely over the network by encrypting all communcation.
Pro Pre-installed on OSX and most Linux distributions
Many *nix systems bundle rsync so there's nothing to install. All you need to do is open up the terminal and start using rsync.
Pro Free and open source
Licensed under GNU.
Pro 5GB of free storage
250% more space than Dropbox basic plan.
Pro Privacy conscious
Terms and conditions favor user privacy.
Pro Encryption
Data is fully encrypted on the client-side, both in-transit and at-rest.
Pro Two-factor authentication
Even free accounts offer 2FA.
Cons
Con No official GUI
To use rsync, you have to know your way around the command line.