Context
This is the first question every procurement department asks. It is also the question every consultancy ducks. Here is a concrete answer, in three sentences and a paragraph: your data remains valid, portable and continuable, because Weaver is a thin layer over open standards. The whole architecture is designed around that property.
The honest version, in three sentences.
Explanation
Three independent mechanisms keep your data viable after Weaver:
The data itself is RDF
A standard, public, W3C-maintained format. Any organisation in the world capable of loading an RDF graph can read your data the day after Weaver shuts down. There are dozens of mature open-source RDF stores; you're not waiting for someone to reverse-engineer a proprietary export.
The structure is ISO 15926-11
The metamodel governing your data is an open ISO standard, not a Weaver invention. Documentation is publicly available. Any consultancy familiar with the standard can pick up the work. We extend ISO 15926-11 with your domain specifics; those extensions are themselves RDF and machine-readable.
The integrations are open APIs
REST, GraphQL, OData, SPARQL, BCF, openCDE. Replacement systems can hook into the same connectors. Source systems (Revit, Relatics, SharePoint) don't need to be reconfigured.
Imagine hiring a builder to construct a house using standard bricks and standard measurements. If the builder disappears, any supplier can replace parts, any tradesperson can repair the walls. Weaver uses 'standard bricks' for data. That is the entire reason we chose this architecture.