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.
Moreover, not depending on cygwin also means that, had there been any issue, we can fix it and send you a new executable within 24 hours in most cases.
Acrosync integrates a file system monitor that can detect file changes. Using the 'continuous upload' 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.
With Acrosync, you can easily set up your own sync server to replace Dropbox, with unlimited storage and a low, one-time cost.
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 is free to trial for 15 days. A commercial license costs $49.99 while a personal license costs $14.99. Licenses can be purchased in-app.
During the beta testing period, enter the promotional code beta to reduce the prices to $29.99 and $9.99 respectively.