I am working with LangChain for the first time. Due to data security, I want to be sure about the storage of langchain's vector store storage. I am using HNSWLib vector store, which mentions it is an in-memory store. What does it mean? Does Langchain/vector stores store any data in its servers?
https://js.langchain.com/docs/modules/indexes/vector_stores/integrations/hnswlib https://github.com/nmslib/hnswlib
HNSWLib store data in the server where the project is host. So if you host your server into vercel then your vector store is running in memory in vercel server. You can test this logic if true when you execute await vectorStore.save(directory); which will generate vector files inside your project directory.