Yandex.Disk - Files on Yandex.Disk won't get lost if your phone or computer breaks.
FTPbox - FTPbox is an open-source application that allows you to synchronize your files to your own host...
CloudBerry Box - CloudBerry Box provides bi-directional synchronization of data across remote computers.
Dropbox - Online Sync and File Sharing
Cloudu - Secure German online storage and file sync service. Apps for all major platforms.
Syncany - Syncany is an open-source cloud storage and filesharing application.