Can some one provide description of how Flashbackup works at a lower level. For example, when it says that flashbackup reduces the disk I/Os by creating a map, I'm trying to find out the details of this map.
What would make this clearer for us is drawing out a sample file system with 10 files, and walking through what happens during a standard backup (e.g., How it goes through the inode table, determines which blocks are associated with each file, etc.) Then, walking through what happens during a flashbackup at the same low-level.
Similarly, how does it allow us to restore individual files?