The length of time you must retain your backups in a Data Vault may vary depending on your needs and legal and regulatory requirements. However, it is often recommended to retain backups for at least six months to a year. This will allow you to have access to previous versions of your data in the event of its loss or corruption.
In addition, it is also recommended to make regular backup copies to ensure that they are up to date. If you have specific needs or legal requirements, it is advisable to consult with a data security expert or legal counsel for personalized guidance.