Back up master as often as necessary to protect the data sufficiently
for your business needs. We recommend a regular backup schedule,which
you can supplement with an additional backup after a substantial
update.

如果你冒险further,你会发现这些细节：

The types of operations that cause master to be updated,and that
require a backup to take place,include the following:

• Creating or deleting a user database.
• If a user database grows automatically to accommodate new data,
  master is not affected.
• Adding or removing files and filegroups.
• Adding logins or other operations that are related to login
  security.
• Database security operations,such as adding a user to a database,
  do not affect master.
• Changing server-wide or database configuration options.
• Creating or removing logical backup devices.
• Configuring the server for distributed queries and remote procedure
  calls (RPCs),such as adding linked servers or remote logins.

因此,如果我们所有的登录都是通过Windows组添加的,并且我们不对数据库进行任何其他更改,这是否意味着对主服务器的一次性备份就足够了？

如果不是,master数据库的标准备份间隔是多少？