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
Pocket Lists - World’s Friendliest To-Do List App
Google Drive - Access and sync your files anywhere
UpNote - A beautiful and clean cross-platform app for notes organizer
Mega - Secure File Storage and collaboration
Synology Note Station - Without needing to spend money on Evernote, Synology Note Station provides a desktop client to organize all your random notes in one place.