Wayne Davison wrote:

Given a better implementation of the --acls option (i.e. one that
doesn't complain if a source disk doesn't support ACLs), that might
make sense.  Another thing to keep in mind, though, is that rsync
always passes the individual options to the remote rsync, so adding
new options to -a makes it inconvenient to communicate with a variety
of rsync versions.  We'll need to balance these issues whenever ACL
support gets officially included in rsync.

  
Yes - ok - so ACLs aren't "officially" there yet. That's actually good in a way. Means there's room to do it right.

Ultimately this is an option that should "just work" and be transparent as part of permissions. As to communicationg with a variety of rsync version perhaps there should be some initial communication about capabilities at the initial connection and adjust acordingly. Older versions would be assumed to not have ACL capability and that data wouldn't be sent. Or if the receiving file system doesn't support ACLs then that data is silently removed.
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