On Tue, Sep 17, 2013 at 6:51 PM, java8964 java8964 <java8964@hotmail.com> wrote:
I thought I was clearer, but your clarification confused me again.
But there is no way we can be sure that these SSTable files will ONLY contain modified data. So the statement being quoted above is not exactly right. I agree that all the modified data in that period will be in the incremental sstable files, but a lot of other unmodified data will be in them too.

The incremental backup directory only includes SSTables recently flushed from memtables. It does not include SSTables created as a result of compaction.

Memtables, by definition, only contain modified or new data. Yes, there is one new copy per replica and the ones processed after the first might appear "unmodified", which may be what you are talking about?