Ask HN: App for collecting a large, searchable database of website snapshots?

I do a lot of research and writing, and it is necessary for me to keep snapshots of the web-based sources I rely upon in my writings. The tool I have used historically is no longer viable, so I am seeking a replacement.

Requirements:

• Support for a very large collection of documents, including the html and assets (images, css, etc)

• Full-text search

• Annotations (ideally in context)

• Saves original source URL

Nice to have:

• Data stored locally (not just cloud-based)

• Option to include linked pages in snapshot

• Support for static files such as PDFs

Anything to suggest or recommend? Thanks!