Hi @kjaques - I assume you want to append each month data rather replace it. For excel based snapshot, i doubt whether it is possible or not. Tomorrow we have a monthly Q&A session on QuickSight. If possible, please register and join so that we can discuss this use case. To register, please follow the below link - Th June 22: Live Q&A Webinar with Amazon QuickSight Expert Solution Architects | Fourth Thursday of the month | 12 Noon PDT
Regards - Sanjeeb