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.
Dood : The Puzzle Planet - A strategy puzzle game for the smart ones
Dropbox - Online Sync and File Sharing
Ordinary Puzzles - A minimalistic puzzle game inspired by Picross and Sudoku.
Google Drive - Access and sync your files anywhere
Trikaya - Atmospheric first-person puzzle game
Mega - Secure File Storage and collaboration