PowerFolder

PowerFolder is a software to sync, share, backup, and access files. PowerFolder directly connects computers and allows to exchange all kind of data, which you want to sync or share between multiple computers. It automatically detects new or changed files and keeps all your computers in sync. All transfers are encrypted and downloads from multiple sources are supported, also PowerFolder is only transferring the changed part of a file and stores previous file versions in a file archive.

Requirements:

Java Runtime Environment 6.0

Limitations:

1GB sync/1-storage trial