AZ-104 · Lab 07 · Azure Storage~3 min
Redundancy is a bill you pay before you need it
The lab selects Geo-redundant storage without discussion. That is a defensible call and it is not the only one. Commit to a redundancy option, see what each one actually costs and covers, then defend your choice to a colleague who disagrees.
The setup
You create the storage account for Contoso's archive. The lab fills it with a data container, a 180 day time-based retention policy, and a share1 file share. Most files are written once and read rarely. Redundancy is the setting you pick before anything else.
datacontainerThe blob container the lab creates, with public access set to private and a 180 day time-based retention policy.
share1file shareThe file share the lab creates, left at the Transaction optimized access tier.
Locally-redundant storageLRSThree copies inside one datacenter.
Zone-redundant storageZRSCopies spread across availability zones inside one region.
Geo-redundant storageGRSThe option the lab selects. Copies in a paired region hundreds of miles away.