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.
oandbackup - Make backups of selected apps on your device and restore from those backups.
Dropbox - Online Sync and File Sharing
Super Backup & Restore - Super Backup & Restore app allows users to backup all their stuff such as pictures, videos, apps, text messages, contacts, call history, and calendar data, etc.
Google Drive - Access and sync your files anywhere
Tenorshare WhatsApp Transfer - Transfer/Backup/Restore WhatsApp on iPhone/Android with One Click
Mega - Secure File Storage and collaboration