Hi, I have retagged with SL and removing NWA as it seems to be unrelated topic to me. I hope this way I can increase the number of Subjact Matter Experts who can look into it and provide further guidance.
Client copy is an option but not for bigger clients as process takes days of time if you have clients in TBs size. It is useful for your Development/SBX environments where you can export smaller clients from one system and import into another system.
For Q/Pre-prod - It is always recommended to do a system refresh as it is faster than a client copy/export, import.
Based on your requirement you follow these methods. And yes, during client export you can optimize resources but you need to have such capacity to cater it.
System refresh duration is purely depend on your backup/restore time, even online backup works but restore time plays an important role.
Once again coming to your initial query - What is your exact requirement? How many clients you have in your source system now? and how many in target? What is the backup tool that you are using and what is the size of database? If you explain all these things, then definitely you can get the best solution from this forum.
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