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.
Timehop - Your digital life history
Dropbox - Online Sync and File Sharing
PastBook - PastBook is an online service that allows you to create your own beautiful photobooks and share them with friends and family.
Google Drive - Access and sync your files anywhere
StoryWorth Holiday Gift - A year of family stories bound in a keepsake book.
Mega - Secure File Storage and collaboration