Retention
The Retention page lets you select a specific number, or Retention level, for historical data persistence. In some cases, you can either completely disable the retention of a feature, or enable the advanced options that provide more specific settings.
Expiration
This lets you select a specific number of days for historical data persistence. To let the data persist forever, you can set this to Never.
Retention level
This lets you select a specific number of items for historical data persistence.
Space retention level
This lets you select a specific space size for historical data persistence.