Working with backup sets : VSS-aware backup sets (Windows) : About VSS-aware backup sets : Retention rules for VSS-aware backup sets
 
Retention rules for VSS-aware backup sets
An additional retention category applies to VSS-aware backup sets only (Component data integration options).
Component data integration options: For an explanation, see the F1 Help for the Retention Rule Settings screen. ("Retention Rule Wizard - Choose Retention Settings")