ARR and retention, revenue and costs, margins, cash, debtors, usage and headcount: every figure on every page and in every chat answer is computed once, from one set of facts, so the site, the chat and your reports agree. The P&L on its page and the P&L in a chat answer are the same rows; the ARR on the Dashboard is the ARR in the board deck.
The facts are built inside the warehouse you already run (today Snowflake or Azure) from your systems' exports, so your data stays where it is and B-Viz works on top of it.
Where the systems themselves disagree, such as invoiced ARR against the CRM, B-Viz shows the reconciliation rather than quietly picking a winner.