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.
Binomo - Binomo: Easy stock trading app provides users with virtual funds through which they can practice share and stock trading on their mobile phones.
Dropbox - Online Sync and File Sharing
Vantagemarkets - Vantage is a regulated CFD broker, providing traders with access to the global Forex market through top tier FX liquidity providers.
Google Drive - Access and sync your files anywhere
XTB - Leading European FX & CFDs brokerage Group
Mega - Secure File Storage and collaboration