Generate excel from a report in SAP system

I am not sure what you are asking, reason being if you are saying that the report is running in the background, then how it will come to know where the file needs to be saved locally (where locally it should be saved).

However assuming few things, what can you try out is you can generate the file (translating data into excel is not a big task and get snippets online easily) on AS.

Once generated, you can move this file from report running location to location of your choice using any SHELL command. It’s not suggested that you make a connection from AS to user’s machine but as it is your main requirement you can give it a try.