Key Points
- Dark data discovery is the process of identifying and managing unused or unknown information across systems and storage locations.
- Examples of dark data include old file shares, PST archives, legacy backups, and orphaned cloud storage.
- Dark data discovery matters because it reduces compliance and security risks, cuts storage costs, and improves MSPs’ visibility.
- Dark data discovery also enables classification and lifecycle control, with measurable reporting and ongoing governance.
MSPs often manage client environments with unstructured or unused files, logs, emails, and backups, or dark data. When left outside a policy, unmarked content can lead to security risks, compliance gaps, and cost inefficiencies. To avoid such pitfalls, MSPs need a proactive and persistent dark data discovery framework, which this guide covers in seven easy steps.
For a visual guide, watch “How to Find and Eliminate Dark Data With Classification, Purview, and Shadow IT Discovery” for an easy-to-follow summary.
7-step process for identifying and managing dark data
To build a workflow that tracks and controls unclassified data, here are some important prerequisites to consider:
- Central register for classification decisions and exceptions
- Discovery tools in core platforms such as Microsoft 365 or Google Workspace
- Ticketing workflow for approvals and scheduled cleanups
- Named data owners for major repositories and applications
- Policy baseline for acceptable data locations, retention periods, and deletion rules
Reminder: Requirements may vary based on systems, policies, and business needs.
Dark data discovery helps MSPs find forgotten or redundant files that inflate storage costs and uncover sensitive or regulated data that could pose compliance risks, such as under GDPR, HIPAA, or client SLAs.
1. Define dark data for each client
Define dark data for each client to set clear discovery boundaries. Write a one-page definition outlining unstructured sources like file shares, OneDrive folders, SharePoint sites, PST files, and backups. List data types that need classification, such as PII, payment data, health records, and credentials, and share examples to ensure technicians align on scope and exclusions.
Action plan: Publish this definition along with practical examples and common false positives so that all technicians and analysts can align on the same boundaries before discovery begins.
2. Build a lightweight classification register
Create a lightweight classification register to serve as the central record for data-handling decisions. Define three to five tiers, such as Public, Internal, Confidential, and Restricted. Record each item’s owner, location, retention rule, and sharing policy to ensure consistent handling across all systems.
Tools like Microsoft Purview can be configured to streamline this process by automatically applying sensitivity labels and retention rules across cloud and on-premises data sources.
Action plan: Add an exceptions table for temporary business needs with start and end dates plus an approver, and store the register in a shared location with read access for responders and auditors.
3. Run discovery to surface dark data
Run discovery to identify ungoverned data before enforcing control measures. Scan cloud platforms, mailbox archives, legacy servers, NAS devices, object storage, and backup repositories. Use content searches to detect sensitive data such as PII or credentials, and document any unowned or personal locations for follow-up.
Action plan: Inventory all unidentified sites, shares, and buckets, add them to the classification register, and flag personal or unmanaged cloud use that violates data policies.
4. Apply lifecycle controls
Apply lifecycle controls to make dark data cleanup a continuous, governed process. Use classification to drive retention labels and automate archival or deletion workflows. Route expired content to a temporary archive, then remove it once no legal hold is in effect.
Action plan: Document legal hold procedures within the classification register to prevent accidental deletion and ensure every retention decision is traceable and compliant.
5. Enforce access and sharing policies
Enforce access and sharing policies to minimize exposure while keeping collaboration smooth. Replace broad permissions with least-privilege access and remove global groups from sensitive repositories.
Action plan: Apply approval workflows or read-only access to high-risk repositories to ensure sensitive content remains under control without blocking legitimate business activity.
6. Clean up safely and repeatedly
Clean up dark data in a controlled, traceable manner to reduce both storage bloat and compliance risk. Move unidentified or noncompliant content to a quarantine area for time-limited review, then notify owners with clear deadlines and default outcomes such as archive or deletion.
Action plan: Maintain a minimal audit trail showing what was deleted, when, by whom, and under which policy to ensure consistent governance and regulatory defensibility.
7. Measure and report progress
Measure and report dark data management progress to demonstrate program value and sustain engagement across teams and clients. For instance, track coverage of discovery scans by repository and data type, total dark data volume reduced, ownership assignment rates, and open exceptions past expiry.
Action plan: Deliver monthly summaries to the technical team for operational insight and quarterly reduction and risk reports for executives.
Common types and examples of dark data
This table classifies the types of dark data and the risks associated with each.
| Dark Data Type | Examples | Primary Risks or Challenges |
| Unstructured user data | Old file shares, desktop folders, chat exports, personal OneDrive or Google Drive files | Contains sensitive info with no classification or ownership; hard to audit or secure |
| Shadow IT data | Unapproved storage tools, personal cloud drives, local database dumps | Bypass company security and DLP policies; create blind spots for MSP monitoring |
| Legacy backups and archives | Outdated snapshots, tape backups, redundant ZIP archives | Store sensitive data beyond retention limits; increase storage costs and breach exposure |
| Email and message data | PST files, mailbox archives, Teams or Slack exports | Often includes PII, credentials, or confidential client data; difficult to govern post-export |
| Application and system logs | Server logs, SIEM exports, old monitoring data | May include user identifiers, IPs, or access patterns; retained longer than necessary |
MSPs should prioritize dark data sources that combine high sensitivity with low visibility, such as orphaned cloud data and legacy backups. Focusing on these first delivers the fastest risk reduction and demonstrates measurable progress in IT asset management.
RMM solutions for dark data management
NinjaOne helps MSPs with the endpoint side of dark data discovery.
Device and software discovery: NinjaOne’s network and inventory scanning identifies endpoints, servers, and installed software across client environments, including unmanaged devices and unapproved applications that may contain unmonitored data.
Reporting: NinjaOne’s reports and dashboards track device and software inventory over time, which supports the monthly and quarterly reports in Step 7.
Together, these give MSPs the endpoint and network visibility that dark data discovery depends on.
Sustainable dark data management framework
NinjaOne and Microsoft Purview cover different parts of the work. NinjaOne handles endpoint visibility and reporting, and Purview handles data classification and retention.
By embedding both into routine monitoring, MSPs can maintain continuous visibility and keep data governance current as client environments change.
