This looks great. Do you have a server or are you just syncing between PCs?

I'm wanting to set up a backup server for music and such, but most virtual server providers (like Linode, DigitalOcean) don't seem optimized toward hard drive space. Could you point me in the right direction?

I sync between PCs. One side must have an open port.

Do you know a good GUI that will tell me about things that happen and files that failed to sync?

It has a built-in web gui - try it!

I know, I don't like web GUIs. Also this cannot notify me during work.

Well it has an event api you can use.

Am in the process of switching....