Rsync. Runs in linux, but cwrsync has been ported for windows. Works over network with a server-side service, and a client to push the data to the server. The server can also "Pull" data from the machines. Also, it runs in local mode. It only copies the changed bits in the file. Some backup programs only copy the changed files, this copies the changed bits, so backups take a fraction of the time.
The downside? It's command line, and people are too lazy to learn CLI args.
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The downside? It's command line, and people are too lazy to learn CLI args.
