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.
Userscloud - Userscloud is a free cloud service that offers unlimited online storage, remote backup capacity, fast uploading, and downloading tools.
Dropbox - Online Sync and File Sharing
Mega - Secure File Storage and collaboration
Google Drive - Access and sync your files anywhere
1fichier - 1fichier is a one-click file storage application that allows you to send your important or personal files over the secure SSL connection.
Hightail - The professional way to send & share files and folders with anyone