Overview

SFS supports resource package-based and pay-per-use billing. Each one has different advantages and disadvantages.

• Resource package-based billing is a prepaid billing mode. 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. It 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 lists the differences between the billing modes.

  Table 1 Differences between billing modes

  Billing Mode	Resource Package	Pay-per-Use
  Payment	Prepaid	Postpaid
  Billing Method	Billed by the subscription term you purchase	Billed based on the used capacity by the hour
  Billed Items	Standard storage	Standard storage/Infrequent access storage
  Changing the Billing Mode	Can be changed to pay-per-use. Pay-per-use billing takes effect only after the resource packages expire. For details, see Billing Mode Changes.	Can be changed to resource package-based billing. For details, see Billing Mode Changes.
  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.