Therefore, before backing up all images to iCloud from iPhone, you need to consider the above factors to access iCloud photos. The common point of iCloud Photo Library and Photo Stream is that you can both sync images between Mac and PC. In addition, iCloud Photo Library cannot transfer photo albums, while Photo Stream can sync. If you back up photos to iCloud Photo Stream, these images will not cost any storage of iCloud. Moreover, the image quality will reduce, because Photo Stream only supports storing web-optimized image formats. However, if you sync images to iCloud Photo Stream, you can only store the recent 1000 images for 30 days, not including videos. You can save full resolutions with many photo formats, like JPG, TIFF, RAW, and so on. iCloud Photo Library is the place to store all images and videos as long as possible. Once you have set to backup images to iCloud automatically, you should figure out the differences between the iCloud Photo Library and Photo Stream.

There are two main choices for users to duplicate photos to iCloud, which are iCloud Photo Library and Photo Stream.

Backup my mac to icloud