Spideroak is fantastic
Having actually installed & tried quite a few of the alternatives, I concluded that Spideroak was fantastic and suited my requirements....
One of the best aspects of Spideroak is that you are not forced to use a single folder for synchronization, but you are able to backup and synchronize any of your existing folders.
One feature I found appealing is their 'Zero-knowledge' encryption policy... (https://spideroak.com/engineering_matters#true_privacy)
Another plus is that it is multiplatform. I have documents/folders synchronized between my Mac & XP machines, in sync and backed up to the cloud. Very easy to use.
Biting the hand that feeds IT
