SpiderOak is free online backup, sync, sharing and storage solution for Windows, Mac OS X, and Linux (Ubuntu, Debian, Fedora & openSUSE) and it is the best alternative to dropbox. Use SpiderOaky to backup, synchronize, and share data across all of your computers, external drives and network volumes.
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1.Go to SpiderOak download page and download the ubuntu client 32 or 64 bit deb package file.
2.Double click the .deb package file or open with ubuntu software center and click the install button.
3.Type your ubuntu password if needed and wait until the installation is complete.
4.To open SpiderOak, click Applications icon or unity dash from unity launcher. And type SpiderOak in the search applications field and click SpiderOak Backup.