The failure to back up data that is stored in a cloud block-storage service can be lost forever if not properly backed up. This article explains how object storage works very differently from block storage and how it offers better built-in protections.
What is Object Storage?
Each cloud vendor offers an object storage service, and they include Amazon's Simple Storage Service (S3), Azure’s Blob Store, and Google’s Cloud Storage.
Think of object storage systems like a file system with no hierarchical structure of directories and subdirectories. Where a file system uses a combination of a directory structure and file name to identify and locate a file, every object stored in an object storage system gets a unique identifier (UID) based on its content.
Thanks to W. Curtis Preston (see source)