I can't. Tried owncloud, as an alternative to my paid Dropbox account. It's incredibly slow to sync anything moderately large. I handed it 30GB of my 70GB home directory, and filesystem traversal on startup was taking 15min. On an ssd. Where Dropbox would take 15-30s.

i think - from reading descriptions/opinions - that the more recent 'seafile' could be even better.