Would a storage block level incremental like zfs work?

On December 19, 2017 11:12:48 AM EST, Rakesh Kumar <rakeshkumar...@mail.com> 
wrote:
>
>> There are multiple solutions to doing incremental backups with
>> PostgreSQL, so I'm not sure why you're saying that they don't exist,
>> because that's really not accurate.
>
>PG's incremental backup is essentially WAL logs applied to a point in
>time.  I am talking about true incremental backup where the db backs up
>only the changed blocks after the last full backup.  In a DW system
>where most of the time it is append only, it makes a huge difference in
>backup time.
>
>I believe there is one tool which looks at mtime/atime of each of the
>data file and takes the decision to back it up or lot.  Not sure how
>robust it is.

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