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I remember also that Spectrum Protect does not keep track of previous ACL attributes too.
So if you change the ACL, than this also affects all backup versions.
This can be change by adding a TESTFLAG, so that each backup keeps its previous ACL attributes.
Perhaps there is an attribute to also change this behaviour?
There are also alternatives to HSM, where there is no need to keep stubs of files.
Take a look at SPFS, can be good alternative
https://www-356.ibm.com/partnerworld/gsd/solutiondetails.do?&solution=56435