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This Delete Incremetal Policy is used only for a incremental crawl.

You need to decide which delete policy to use, as Aspire only allows one at the time.

Days before delete (sends the deletes after an specific number of days has passed since the last time the URLs were accessed).
Iterations before delete (sends the deletes after an specific number of incremental crawls since the last time the URLs were accessed).
If the policy is not created, then is used a default policy Immediate (which means sending deletes as soon as a URL is not accessed during an incremental crawl).

On the manager side we define first delete incremental policies and we can assign ids of those policies to:

seeds
connections
When is assigned to both, then Delete Incremental Policy in Seed is only used.