Reference:
https://docs.microsoft.com/en-us/onedrive/set-retention
https://docs.microsoft.com/en-us/onedrive/retention-and-deletion

Topic 1, Fabrikam, Case Study
Overview
This is a case study. Case studies are not timed separately. You can use as much exam time as you would like to complete each there may be additional case studies and sections on this exam. You must manage you're your time to ensure that you are able to complete all included on this exam in the time provided.
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Cloud Environment
Fabrikam has a Microsoft 365 tenant that contains the following resources:
* An Azure Active Directory (Azure AD) tenant that syncs to an on-premises Active Directory domain named corp.fabrikam.com
* Microsoft Cloud App Security connectors configured for all supported cloud applications used by the company Some users have company Dropbox accounts.
Compliance Configuration
Fabrikam has the following in the Microsoft 365 compliance center:
* A data loss prevention (DLP) policy is configured. The policy displays a tooltip to users. Users can provide a business justification to override a DLP policy violation.
* The Azure information Protection unified labeling scanner is installed and configured.
* A sensitivity label named Fabrikam Confidential is configured.
An existing third-party records management system is managed by the compliance department.
Human Resources (HR) Management System
The HR department has an Azure SQL. database that contains employee information. Each employee has a unique 12-character alphanumeric ID. The database contains confidential employed attributes including payroll information, date of birth, and personal contact details.
On-premises Environment
You have an on premises file server that runs Windows Server 2019 and stores Microsoft Office documents in a shared folder named Data.
All end-user computers are joined to the corp.fabrinkam.com domain and run a third-party antimalware application.
Sales Contracts
Users in the sales department receive draft sales contracts from customers by email. The sales contracts are written by the customers and are not in a standard format.
Employment Applications
Employment applications and resumes are received by HR department managers and stored in either mailboxes, Microsoft SharePoint Online sites, OneDrive for Business folders, or Microsoft Teams channels.
The employment application form is downloaded from SharePoint Online and a serial number is assigned to each application.
the resumes are written by the applications and in any format.
HR Requirements
You need to create a DLP policy that will notify the HR department of a DLP policy violation if a document that contains confidential employee attributes is shared externally. The DLP policy must use an Exact Data Match (EDM) classification derived from a CSV export of the HR department database.
The HR department identifies the following requirements for handling employment applications:
* Resumes must be identified automatically based on similarities to other resumes received in the past
* Employment applications and resumes must be deleted automatically two years after the applications are received.
* Documents and emails that contain an application serial number must be identified automatically and marked as an employment application.
Sales Requirements
A sensitivity label named Sales Contract must be applied automatically to all draft and finalized sales contracts.
Compliance Requirements
Fabrikam identifies the following compliance requirements:
* All DLP policies must be applied to computers that run Windows 10, with the least possible changes to the computers.
* Users in the compliance department must view the justification provided when a user receives a tooltip notification for a DLP violation.
* If a document that has the Fabrikam Confidential sensitivity label applied is uploaded to Dropbox. the file must be deleted automatically. - The Fabrikam Confidential sensitivity label must be applied to existing Microsoft Word documents in the Data shared folder that have a document footer containing the following string: Company use only.
* Users must be able to manually select that email messages are sent encrypted. The encryption will use Office
365 Message Encryption (OME) v2. Any email containing an attachment that has the Fabrikam Confidential sensitivity label applied must be encrypted automatically by using OME.
* Existing policies configured in the third-party records management system must be replaced by using Records management in the Microsoft 365 compliance center. The compliance department plans to export the existing policies, and then produce a CSV file that contains matching labels and policies that are compatible with records management in Microsoft 365. The CSV file must be used to configure records management in Microsoft 365.
Executive Requirements
You must be able to restore all email received by Fabrikam executives for up to three years after an email is received, even if the email was deleted permanently.

https://docs.microsoft.com/en-us/microsoft-365/compliance/event-driven-retention?view=o365-worldwide