When migrating a bank connection from one data provider to another (e.g., MX to Plaid), users may lose custom transaction categorizations, notes, and tags they have applied over time. Currently, the migration wizard does not warn users about this possibility, nor does it offer any way to back up or export their customized transaction data before proceeding.

This feature request asks for:
1. A clear warning step in the migration flow explaining that user-applied categorizations and notes may not carry over to the new connection.
2. An option to export or back up transaction data (including custom categories and notes) before completing the migration.

This would allow users to make an informed decision before migrating and preserve years of financial record-keeping that they have built up in the app.