For hosting common files it's ok. Also it is on Android too do, great to transfer files between your Windows and your phone. But if you want better security you have to subscribe a monthly offer.
Dropbox - Online Sync and File Sharing
FileHamster - Personal Revision Control - File Hamster - File and Document Revision, Retrieve and Restore
Google Drive - Access and sync your files anywhere
AppleWorks - AppleWorks was office suite by Apple that combined a word processor, a drawing program, a painting...
Mega - Secure File Storage and collaboration
LBackup - An rsync based backup solution for *NIX based system(s), with a flexible scripting subsystem which...