I've got a ton of installer files and essential documents that I like to have in sync between both my computers at home. That means I always have a backup and I can administer the second computer better. For this, a syncing application is a perfect choice, but unfortunately getting a freeware application is out of the question, as they are far too basic or do not have certain features that would be required to automate the task. Therefore paid software is the only way forward.
You can check out Microsoft's free SyncToy that I've reviewed previously.
So what am I looking for?
1. An elegant, yet simple solution
2. You don't need to be a computer engineer to figure it out
3. Should have the ability to schedule and/or make changes automatically
4. Should be reasonably priced, though free would be the icing on the cake
Note: FTP backup and email through SMTP features were not looked into for this brief review.
If upgrading from a previous version, always sync all your files first and then upgrade, otherwise Syncing applications have a habit of woefully forgetting to sync remaining changes after version upgrades.