I haven't tried it but this is an open source sync tool http://seafile.com/en/home/ Run your own server and client
That's when the HIPAA compliance question comes up... Seafile looks like a good idea, will give it a try some time. Hopefully not too hard to set up.
http://help.cubby.com/knowledgebase/articles/154547-is-cubby-hipaa-compliant- $4/month for 100Gb of storage during beta for logmein customers. Folder syncing and encryption. They're working on obtaining HIPAA certification
A cloudless optionDespite our best security practices, we know some people just aren’t 100% onboard with using the cloud, so we don’t force anyone to use it. Cubby gives you the option for DirectSync™, the ability to sync your data securely and directly between computers without storing it in the cloud.This is what I want. Only pro version can do this though, price starts at $4/month. Supposed to be unlimited space with direct sync and 100gb cloud.
Signed up for 1 year. Now sending all office files back to home file server. Initial synch has not finished after over 36 hrs for 13 gb data (1.3 gb left). I could have used the "seeding" option: copy files directly to target PC first using an external hard drive, than synch and merge to save time but I wanted to see the transfer speed. Renew next year will be $6.99/mo, reasonable comparing to other cloud services.