What are the main types of hotel files? Is it necessary to back up the documents of all departments? What materials need to be backed up for other electronic documents?

Now there are many electronic documents, and the archives are just some labor contracts, insurance and company licenses. What I want to say is that the turnover of people in the catering industry such as hotels is relatively large, and it won't take long for others except for documents such as company licenses (for example, if an employee comes to sign a labor contract and leaves in February, these documents will remain for one year or it will be useless to destroy them).