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
Duplicacy - A new generation cross-platform cloud backup tool
Google Drive - Access and sync your files anywhere
Restic - Easy: Doing backups should be a frictionless process, otherwise you are tempted to skip it.
Mega - Secure File Storage and collaboration
UrBackup - UrBackup is a open source client/server backup system, that through a combination of image and file...