The Destiny Content Vault (DCV) is a content model that was implemented in Year 4 of Destiny 2. To create a sustainable ecosystem where the world can continue to evolve in exciting ways, and where we can update the game more quickly, each year we will cycle some destination and activity content out of the game (and into the DCV) to make room for new experiences. The DCV will contain all destinations and activities from both Destiny 1 and Destiny 2, with the potential for vaulted content to return to the game in the future.
Destiny Content Vault: Year 4
“30th Anniversary content (both free and paid) will not be placed in the Destiny Content Vault with the launch of The Witch Queen. Bungie will have another update about this later this year but expect to enjoy The Xur-led adventures through 2022.”