Why shouldn't I clone production DB locally in order to debug an issue / recreate a bug? What is the alternative?

Who says you shouldn't?

@theScientist the only problem is that I have to download 300 MB Everytime I need to debug an user issue.

Well maybe the issue can be reproduced on a test/qa system... That does not seem like much to download but there could be other restrictions like you might need to anonymise the data before you download it for example if it is patient records in a medical system

@spacem I need to download the database to know every variables and help me debug easily.

If u use ur Backups U can verfy them the Same time:))