Microsoft Purview’s Archive Update: Cut SharePoint Storage Costs Without Deleting Files:

Your SharePoint storage may be holding years of completed projects, historical reports, and documents that rarely get opened. These files still matter for compliance, but keeping them in active storage can add unnecessary cost.

Microsoft Purview’s archive update gives you a way to manage that balance. You can move eligible SharePoint files into Microsoft 365 Archive through retention policies while keeping them protected and discoverable for compliance.

Microsoft Purview Retention Policies Get an Archive Action

Microsoft Purview Data Lifecycle Management adds an archive action to retention settings. You can use it to move eligible inactive files into Microsoft 365 Archive instead of leaving them in active SharePoint storage.

The important distinction is archiving, not deleting. Your files move to a lower-cost storage tier while remaining subject to applicable retention requirements and legal holds.

With retention-based archiving, you can:

• Move eligible SharePoint files into archive storage.
• Preserve content for Microsoft Purview eDiscovery and content search.
• Maintain applicable retention and legal hold protections.
• Exclude archived files from Microsoft 365 Copilot indexing.

This gives you more control over where retained content lives without treating every document as an active working file.

Ease SharePoint Storage Pressure, Preserve Compliance Visibility

Microsoft 365 Archive separates inactive content from the files you use every day. Archived files no longer consume your tenant’s active SharePoint storage quota and instead count toward Archive storage consumption.

This creates an opportunity to reduce storage costs without deleting documents your organization must retain. Your actual savings depend on storage usage and Microsoft 365 Archive billing.

Moving a file into archive storage does not remove it from compliance discovery workflows. You can still locate archived content through Microsoft Purview content search and eDiscovery.

For your storage strategy, that means you can preserve required information without keeping every retained file in the active storage tier.

Keep Outdated Files Out of Microsoft 365 Copilot Responses

Keeping a document for compliance does not always mean it should remain part of everyday information discovery.

Archived SharePoint files are excluded from Microsoft 365 Copilot indexing. This can help improve response relevance by keeping inactive content out of Copilot’s indexed information sources.

Your archived files remain available for compliance searches, but they no longer serve the same role as active content in Copilot indexing.

This distinction helps you separate long-term retention needs from the information used to support current work.

How SharePoint Retention-Based Archiving Works

The archive action is not enabled by default. Your existing retention policies and labels will not begin archiving files unless you update them to include the action.

In the retention settings, select “Archive retained items in secure and compliant Microsoft 365 Archive to reduce cost”. You can then configure when eligible files should move into archive storage.

The archive period can be based on:

• When the file was created.
• When the file was last modified.

These settings matter when defining your policy. The archive action uses the configured creation or modification date, rather than assuming a file is inactive because it has not been opened recently.

Items that don’t support the archive action remain active and event-based retention is not supported for file-level archive.

Licensing, Access, and Reactivation: What Admins Should Know

File-level archive requires a Microsoft 365 E5 license. You also need to configure Microsoft 365 Archive pay-as-you-go billing to use its cost-saving benefits.

Archiving changes normal file access. An archived file must be reactivated before normal access resumes, while compliance search and export capabilities remain available.

Before updating your retention settings, account for these details:

• A user with read access can reactivate an archived file.
• Retention and hold requirements continue after reactivation.
• A reactivated file cannot be archived again for 120 days.
• File archive actions are recorded in the Microsoft 365 audit log.

Keep the workload scope clear when planning your changes. File-level archive is documented for SharePoint sites, so you should not assume the same capability applies to OneDrive accounts.

Make SharePoint Data Lifecycle Management More Intentional

Microsoft Purview’s archive action gives you another way to manage content that must be retained but no longer needs a place in active SharePoint storage.

Begin with a focused set of suitable files and review the policies that govern them. Confirm access needs, compliance obligations, and expected costs before enabling the archive action.

A well-planned approach keeps everyday content accessible while preserving inactive files in a storage tier better suited to long-term retention.