Microsoft Fabric get all its data from OneLake. I believe all storage, except Real Time Intelligence (RTI), uses OneLake to ensure there is only one copy of the data.
Left side of the diagram/Data sources:
Any data source - copy data from any source into a Lakehouse, and the Parquet and Delta is stored in OneLake and exposed via the Catalog Layer
Mirroring: Some data sources are mirrored into OneLake Parquet, including Snowflake, PostgreSQL, and Azure SQL 2025.
MS Fabric SQL is part of Fabric, and the SQL database is mirrored into OneLake.
Shortcuts - 3rd party software holds the parquet* data and allows MS Fabric to query the data.
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