Odoo Database Extraction Expert Needed

I need an Odoo expert to help extract a database from an old version of Odoo for backup and archival purposes.

Requirements:
- Extract customer data, inventory data, and financial data
- Experience with legacy Odoo databases is a plus
- Ability to work with unknown versions of Odoo

Ideal Skills and Experience:
- Proficiency in Odoo, especially older versions
- Strong database extraction and migration skills
- Data integrity and security awareness

Please provide your experience and approach to handling this task.