Overview

There are yearly/monthly and pay-per-use billing modes. Each one has different advantages and disadvantages.

• Yearly/Monthly is a prepaid billing. You pay in advance for a subscription term, and in exchange, you get a discounted rate. The longer the subscription term, the bigger the discount. Yearly/Monthly billing is a good option for long-term, stable services.
• Pay-per-use is a postpaid billing mode. You pay as you go and just pay for what you use. There are no wasted resources.
  Table 1 describes the differences between the two billing modes.

  Table 1 Differences between billing modes

  Billing Mode	Yearly/Monthly	Pay-per-Use
  Payment	Prepaid	Postpaid
  Billing Method	Billed by the subscription term you purchase	Billed by the hour
  Billed Items	Disk backup vaults, server backup vaults, SFS Turbo backup vaults, hybrid cloud backup vaults, and replication vaults	Disk backup vaults, server backup vaults, SFS Turbo backup vaults, hybrid cloud backup vaults, replication vaults, and cross-region replication traffic
  Changing the Billing Mode	Yearly/Monthly can be changed to pay-per-use only after the yearly/monthly subscription duration ends.	Pay-per-use can be changed to yearly/monthly.
  Changing the Specifications	Vault capacities can only be expanded.	Vault capacities can be expanded.
  Application Scenarios	Recommended for resources expected to be in use long-term. A cost-effective option for scenarios where the resource usage duration is predictable.	Recommended when the resource demands are likely to fluctuate and you want more flexibility.