I think I got up to something like 7-8Tb in total storage for my Xbox before I gave up, but I only realized how unnecessary all that was afterwards. It was a slow build up. Few physical games a year, then a bunch more titles from GwG, and finally Game Pass. Feels silly now, but keeping all games installed was perfectly feasible not too long ago (natural time to stop to reconsider would have been when I ordered the second external HDD, but think hurt brain, me like not! Buy more feel good!)