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.
Backblaze - Backblaze's remote backup automatically backs up your data to our secure datacenter.
Dropbox - Online Sync and File Sharing
CrashPlan - CrashPlan for Small Business backup software offers the best way to back up and store business & enterprise data securely - offsite, onsite & online in the Cloud.
Google Drive - Access and sync your files anywhere
ManageWP - ManageWP is a service for bloggers, site owners and web based companies helping them manage multiple WordPress sites from one dashboard.
Mega - Secure File Storage and collaboration