System copy for QAS

We are Go Live before 2 years.

Our SAP Landscape is Development->Quality->Production.

Now we want to refresh Quality server thru system copy.

So we can have same data, config and abap development as our Production. So it very useful in testing.

At present there are many abap developments which are not transfer to production due to some reasons.

So we are facing problem during testing as Production and Quality abap developments are different in some cases.

Is is advisable to re-fresh quality with production thru system copy?

Request you all to please share your experience.

Regards,

-dt