Required. The name of the file share. Must use 1-16
characters for the basic service tier and 1-63 characters
for all other service tiers. Must use lowercase letters,
numbers, or underscores [a-z0-9_]. Must start with a
File share capacity in gigabytes (GB).
Filestore defines 1 GB as 1024^3 bytes.
The resource name of the backup, in the format
that this file share has been restored from.
This field is a member of oneof_ source.