Assume I have an S3 bucket with continuous backup enabled. Now there are some file a in it, which is heavily updated.

How do we do the continuous backup?

• Is it bucket-wise? For every change per file, we have a copy of the entire bucket?
• Is it file-wise? For every change per file, we have a new copy of the entire file?
• Is it byte-wise? For every change per fille, we just store the updates of the individual bytes?

Personally, since there are many small changes per file and the files can by quite considerable in size, I would prefer to do something like the byte-wise solution.