If you Clear and Delete everything then you will delete the THX calibration video and will have no way to get it back. I recently sold one of my Elites and have a second one up for sale. I just did a clear and delete that cleared all of the suggestions and season passes. And made sure all the streaming services were unlinked from my accounts. Then I also deleted most of the shows in the "My Shows" list. But I mainly wanted to make sure that THX video stayed on the box.
__________________ Roamio Pro TiVo Mini x3 Roamio Basic OTA
39TB unRAID1--53TB unRAID2--36TB unRAID3