Hi @Roberto ,
what kind of local server are you using on-premises to run this application?
CPU, RAM, Disk, OS?
Based on this information you should calculate the costs using the Azure Price Calculator: https://azure.microsoft.com/en-us/pricing/calculator/
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(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)
Regards
Andreas Baumgarten