The storage size is based on the chosen plan and includes both Mail and WorkDrive storage.
In the Workplace Standard plan, each user gets 30 GB of email storage and 10 GB shared
WorkDrive storage (100 GB shared team storage for 3-10 users in WorkDrive with an additional
10 GB for every new user).
In the Workplace Professional plan, each user gets 100 GB of email storage and 100 GB shared
WorkDrive storage (1 TB shared team storage for 3-10 users in WorkDrive with an additional
100 GB for every new user).