One thing I use now is a "protected" folder by using encfs on my imac which then is synced to an external hosting provider where I have some GB free. This is also synced into a windows and macbook pro machine of coworkers which both have the password for that encfs. This way we have an "sharepoint" for all of us similar to dropbox but encrypted at the third party system. Basically we just share small documents there. This works very well so far! Still I wait for "tresorit" to have their mac client finished.