I've used SpiderOak and I was happy with it. I only used it to synchronize files across my laptops and desktops so I don't have any experience with mobile clie

I've used SpiderOak and I was happy with it. I only used it to synchronize files across my laptops and desktops so I don't have any experience with mobile clients for it. I now use cron, rsync, and ZFS snapshots for versioning of all of my home directories. Both solutions worked well for me and which one, if either, is best depends on your situation.