Is it possible to use Analysis Services to create an ABF backup file and then somehow restore it, or convert it, to a PBIX file? I know that an ABF file only contains data and metadata, but that is all we need. We don't need the visuals etc.
Please find in the following documentation the scripts and methods to restore abf's to datasets. It is a Premium (PPU, per capacity or embedded) option : https://learn.microsoft.com/en-us/power-bi/enterprise/service-premium-backup-restore-dataset
A new capability will be given by the product group to migrate your Analysis Services directly to Power BI through the portal : https://mybuild.microsoft.com/sessions/c5a57757-aee3-41f4-b03b-6fc94c56a4ed
You are able to restore to a dataset, but you won't be able to convert to pbix directly.
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