If you're talking about a place to store things:
* Dispersal: This refers to the act of scattering things out.
* Distribution: This means spreading things out to different locations.
* Disposal: This refers to getting rid of things.
* Destruction: This means destroying things.
If you're talking about a collection of data:
* Deletion: This refers to the act of removing data.
* Erasure: This means completely wiping out data.
* Absence: This implies a lack of data.
* Non-existence: This refers to the state of something not existing.
If you're talking about a source of information:
* Ignorance: This means lacking knowledge.
* Uninformed: This refers to not having information.
* Blindness: This symbolizes not seeing or knowing.
The best antonym depends on the specific context of how you're using the word "repository."