I thought that --whole-file option already did that
One thing about the rsync protocol is that it is disk IO expensive on _both_ ends to save network bandwidth, so when using rsync for backups issues on the backup server are more noticeable than the issues distributed out among the client population, especially when running multiple backups in parallel. The btrfs COW problems are a corollary to that, on the clients which are being read or among individual servers doing file transfers isn't not a problem, when collecting rsyncs from many servers all the sudden this issue is a noticeable problem.
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