When comparing Tresorit vs rsync, the Slant community recommends rsync for most people. In the question“What are the best personal file-syncing solutions?” rsync is ranked 2nd while Tresorit is ranked 5th. 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 Client-side encryption
Encryption is performed before content gets uploaded to the cloud.
Pro Cross-platform
With clients for Windows, Mac, iOS, Android, Windows Phone, and Blackberry.
Pro Free storage space (get additional space through bonuses)
5 GB, up to 16 GB with bonuses.
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.
Cons
Con No Telephone Support
Con Proprietary
Because the software is proprietary, there's no way to review the security practices or really know how the software operates under the hood. As such it can be considered as not safe for sensitive information.
Con Significantly more expensive than just about everything else
Con No official GUI
To use rsync, you have to know your way around the command line.