CloudDrive is a client software for Adobe Acrobat Online Storage Service, which offers 5GB free online storage for each account. So, when you use CloudDrive, all your files are stored in Adobe Acrobat Online Storage Service.
Adobe Acrobat Online Storage Service, like most other cloud storage solutions, such as Google Docs, Microsoft Skydrive, only offers you to upload/download files through their websites.
Google Photos Backup lets you upload photos from your PC to your Google Drive
