Why are differntial backups done this way?

  • My random thought for a Friday and I am sure if I had one of my Internals books by my side it would be in there, but what is the deal with the differential backup?

    A differential backs up any extent that has changed since the last full. Well, if there was only one change in a given extent, the entire extent is backed up. Why not just grab the page that changed? Yeah, extents are a basic building block of SQL Server..... just seems like there might be a better way to do that.

  • You can not back up a page so you are going to have to stick with the current backup strategy.

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  • Right. I understand that. Just wondering why MS architected it that way.

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