Acrosync for Windows can sync entire folders with any Linux/Mac/NAS without installing server software. That is because it is the only native Windows implementation of rsync, a powerful folder sync tool that is ubiquitously installed by default in the non-Windows world.
Acrosync for Windows is not dependent on cygwin and it is very easy to install. Just download a small installer and a few clicks later you're ready to go. An ssh client is built-in, so there is no need to setup password-less login for rsync over ssh.
Acrosync integrates a file system monitor that can detect file changes. Using the default backup mode, new or modified files will be automatically and almost instantly uploaded to the rsync server. File deletions can also be automatically propagated to the server if the 'propagate deletions' option is selected.
Note that automatic sync is one way, i.e., from client to server. Acrosync does not support automatic download when files on server side change.
When this option is selected, Acrosync is capable of creating space-efficient incremental hourly backups on the server, taking advantage of the '--link-dest' option provided by rsync. This essentially turns any Mac/Linux/NAS into a Time Machine style backup server, without installing server software and at no extra cost.
When run as administrator, Acrosync can invoke the Volume Shadow Copy service prior to opening files. This way, files locked by other processes can still be uploaded, guaranteeing consistent backups on the server.
Acrosync can connect to almost any Linux computer even without server-side configuration. This includes not just desktops but also servers, such as VPS or dedicated servers. A remote access account provided by most companies and universities works too. Or even a small form factor computer like Raspberry Pi.
Acrosync for Windows comes with a 15 day trial with all features available.
Acrosync for Windows runs on Windows XP, Vista, 7, and 8.
To remove Acrosync for Windows, open the Start menu, select All Programs, then expand the Acrosync group, and click the Uninstall Acrosync menu item.