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.
Waddle Photos - Meaningful stories about your children.
Dropbox - Online Sync and File Sharing
Toca Boca - We make digital toys from the kid perspective.
Google Drive - Access and sync your files anywhere
MentalUP - Entertain and test your children with >120 games
Mega - Secure File Storage and collaboration