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The SecPropertyStoreBackupSize entry determines the number of system pages held in memory to back up the secondary property cache.
||1024 (x86 processors),
512 (RISC processors)
||32 - 500000 (x86 processors),
16 - 250000 (RISC processors)
For more details, see the PropertyStoreBackupSize entry, which serves the same function for the primary property cache.