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.
MirrorBackup.net - Mirror Backup protects from data loss by continuously monitoring files and folders, and backing them up to the cloud or a local drive when they change.
Dropbox - Online Sync and File Sharing
UKs Kalender - This program helps you organizing your dates and tasks and reminds you of upcoming events.
Google Drive - Access and sync your files anywhere
Dshutdown - Utilities freeware by Dimio, DShutdown, DSynchronize, HDHacker, DTaskManager and DSpeech
Mega - Secure File Storage and collaboration