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
Tagsdock - Tag Instagram photos instantly from your iOS keyboard.
Google Drive - Access and sync your files anywhere
Metaplug - Search engine for Instagram
Mega - Secure File Storage and collaboration
Jetpack App - The fastest way to copy your hashtags for Instagram