Not sure what's your real situation.
If you schedule a report running as daily basis, you need to subscribe and this will send the report to your email box. So you could find the previous result from your email inbox.
Another way is use parameter to control the report execution. e.g. if your report is based on date, you can use as date parameter and every time when you run it, you can input what ever date you want to see the report.
Hope this could help.
Thanks for your response! Does Tableau keep a history of what it sends to the user on the Tableau server? So that the admin can retrieve it from there?
I don't think so at this stage.