SQL Azure quickly becomes inefficient (in term of speed and price) if you store your products/pictures in SQL Azure
The Azure Blob Storage plugin eliminates this issue and permit the upload, the download and the deletion of a "downloadable" product/pictures stored in the Azure Blog Storage/CDN.
Cloud Storage plugin expands your nop (nopCommerce) enabling a 100% integrated way to have your files wherever you want.
It is a set of pictures/files providers which allows the integration of custom, external, and cloud based file systems out of the box. For example: Microsoft Azure/CDN, Amazon S3 / CloudFront.