Under the term IDV (Individual data processing) Excel files in particular are subsumed. Compared to databases, they are developed quickly, flexible and easily adaptable. Due to the associated risks, they are increasingly regulated by supervisory regulations. The BaFin circular 10/2017 (BA) 16.08.2021: Bank supervisory requirements for IT (BAIT) summarizes the rules. The applications are divided into protection requirement classes and documented, Depending on this, after analyzing the individual tools, you determine measures to comply with the regulatory requirements.