Rsync is an open source utility that helps users back up and synchronize files and directories between two or more computers. It is an essential tool for backing up or synchronizing data across multiple computers. It is a very powerful tool that can be used to efficiently transfer files and directories between two or more machines over the network, even over slow or unreliable links. It can also be used to efficiently copy files between two or more directories on the same machine. Rsync works by comparing the source and destination directories and only transferring the differences between them. This makes it an efficient way to keep files in sync across multiple computers. Rsync can also be used to securely transfer files to and from remote servers using the SSH protocol. It supports compression and encryption of data to ensure the security of the data being transferred. Rsync can also be used to mirror entire directories and can be used in conjunction with a variety of other programs and services to create a robust backup system.
Supports a wide variety of cloud services, easy to set up with most of the ones I've tested.
It only supports insecure, very irresponsible remote backups.
Discontinued Latest version 2.1 publicado el 24/11/2009
Discontinued Last updated: 2014-10-11, see https://sourceforge.net/projects/synkron/
Discontinued The project is no longer being developed. The latest version, 6.0, released in March 2012, can still be downloaded from the official website.
It works very well on many platforms. The only complaint is that, like rsync, you must familiarize yourself with a set of "command line" parameters in order to use it.