Microsoft Fabric Architecture
Fabric puts workloads on one lake and, by default, one capacity. See what that buys, where the pool becomes a failure domain, and what a Synapse move costs.
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Mirroring (Microsoft Fabric)
Mirroring replicates an operational database into OneLake continuously, with no pipeline to build. It is still a copy, with lag and retention to manage.
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OneLake
Every Fabric tenant has exactly one OneLake. Workloads store and read Delta or Iceberg tables in it, so one copy of data can serve Spark, SQL, and Power BI.
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OneLake Shortcut
A shortcut makes an S3 bucket or another workspace’s table look like a local folder in Fabric. No separate copy is maintained, though optional caching can store files locally, and deletes and access can reach the source.