Super Flexible File Synchronizer is a fast, and (as its name suggests) highly configurable file synchronisation and backup tool.
And so while the program allows you to specify both local and remote folders to synchronise, with support for FTP, FTPS, SFTP/SSH, WebDAV, SSL, HTTP, and Amazon S3 web storage, that's just the start.
You can also choose the copying direction.
There are three possible synch types. Standard copying copies new, missing or modified files from one folder to another, but doesn't delete anything; SmartTracking is used for two-way synchronisation, and can detect and deal with deleted and conflicting files; and Exact Mirror simply duplicates the contents of one of your folder, in the other.
You're also able to add Include and Exclude filters to define exactly which files will be synchronised.
And a powerful scheduler can run your sync job at a specific time, when your PC starts, when it shuts down, or in real time.
The whole process then runs very speedily, thanks to its delta copying technology. This means it only copies the changed portions of files, potentially saving a great deal of bandwidth.
There's versioning support, which allows you to keep multiple older versions of each file in the backup. Or course there are several file naming schemes available to support this, and you can choose the one that works best for you.
And these are only the initial features. Switch the program to Advanced Mode and you'll find even more possibilities on offer.
Please note, the price we're quoting here is for the full Professional Edition. If you can do without some of the more advanced features, like real-time synchronisation, then the Standard Edition may be sufficient, and it's cheaper at $39.90. Follow the Buy link for details.
It's not cheap, but then Super Flexible File Synchronizer is one of the best backup tools around