Matthew Seaman wrote on 04/20/2016 12:43:

On the release of 11.1 there would be a complete new set of system
packages generated, and the upgrade process would install the new
versions of those packages all round, even if the content of an
individual package was identical to the one in 11.0.  There's probably a
handy optimization where we compare the before and after checksums for
package files and don't overwrite on disk what is identical between
package versions, but do update all of the bookkeeping in the pkgdb.

This will be a really nice feature which can save a lot of bandwidth and storage for backups after upgrade. (but I don't know how many files are usually unchanged between upgrades)

Miroslav Lachman

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