What are the differences between Auto-Upload and Fetch?

	Auto-Upload	Fetch
Retrieved Images	Cloudinary provides full management functionalities (like "upload" type). All features available.	Managed by the user, Cloudinary provides transformation and delivery only.
Transformations	Create multiple versions of the same image using Eager-Transformations, or apply Incoming-Transformation.	On-the-fly transformations only.
Upload Presets	Automatically apply pre-defined actions to apply to uploaded files (upload-preset is named as the mapped folder)	N/A
SEO-Friendly URLs	Shortened URLs	Long (verbose) URLs
Access Permissions to originals	Restrict access to originals by utilizing private images	N/A
Image Availability	Full storage management, backups, revisions	Cloudinary provides caching only
Handling Consistency	Identical treatment of newly uploaded and old	N/A
Auto Refreshing	Requires explicitly deleting/overriding existing resource	An automatic refresh policy is available on paid plans

More information on the various features is available here: