Hi @Tevon2.0 ,
As per my understanding, you want to check if sites under a web application have been crawled, right? If so, you can go to search service application > Crawl log > URL view and search by URL.
And Continuous Crawl doesn't save items repeatedly. So, it doesn't mean that Continuous Crawl takes more disk space. The difference between Continuous and Incremental crawl, take a reference to this article: Continuous Crawl and the Difference Between Incremental and Continuous Crawl.
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