File Share redundancy

 Azure Files standard shares supports four data redundancy options:

1. LRS

2. ZRS

3. GRS

4. GZRS 

Azure Files premium shares support both LRS and ZRS, ZRS is currently available in a smaller subset of regions.

if you opt for read-access geo-redundant storage ( RA-GRS ), you should know that Azure File does not support read-access geo-redundant storage ( RA-GRS ) in any region at this time. File shares in the RA-GRS. storage account work like they would in GRS accounts and are charged GRS prices.