Spideroak does both of those things. They call those features "sync" and "share". I have a "work" folder that is synced to my work laptop and desktop, but not

Spideroak does both of those things. They call those features "sync" and "share". I have a "work" folder that is synced to my work laptop and desktop, but not my personal laptop. I haven't used the "share" feature, but it exists and it says right at the top of the tab in the client that it's for making public links.