Best Windows Phone Apps to Backup Files Online

Freemium

Dropbox is an easy to use freemium cloud storage solution. It has a client sync utility for multiple platforms.

Freemium

MEGA is the cloud-based file hosting solution.

Freemium

Microsoft OneDrive is a cloud-based storage solution from Microsoft.

Freemium

Box is an online file sharing and content management service.

Find apps to do interesting things:

Manage relationship with existing and past customers.

Converts youtube video into MP4 format and allows you to download it

Opens PSD (Photoshop Document) files.

Read and manage RSS Feeds.

Send and receive messages when online.

Broadcast live video feeds both privately and publicly