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
WP SlackSync - Synchronize Slack channels + chats with your Wordpress site
Google Drive - Access and sync your files anywhere
yaP - Innovative digital banking. Sign up to YAP and get a digital banking account – No hidden fees, no minimum balances, and no paperwork.
Mega - Secure File Storage and collaboration
Slackin - Create your own public Slack chat community