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Creating an every quarter (3-months) scheduled scan using Discovery UI or tw_scan_control is not possible AFAIK. An external scheduler that will run a one time scan via tw_scan_control or REST API call, is what you need.
I just searching for the same subject and seems to be now possible to perform scheduled discovery in ADDM...
1 of 1 people found this helpful
Yes it is possible to perform scheduled discovery but not using a quarterly frequency.