Spideroak may be an option, it has has a headless mode. https://spideroak.com/faq/questions/67/how_can_i_use_spideroak_from_the_commandline/ https://spideroak.

Spideroak may be an option, it has has a headless mode. https://spideroak.com/faq/questions/67/how_can_i_use_spideroak_from_the_commandline/ https://spideroak.com/faq/questions/67/how_can_i_use_spidero...