Depends on the diff. If the diff is not aligned by bits a single bit offset might cause double the size, ie the full file to delete and a full file add. >If y

Depends on the diff. If the diff is not aligned by bits a single bit offset might cause double the size, ie the full file to delete and a full file add. >If you insist on using the "snapshot" abstraction But its not insisted. Both abstractions are used as needed.