A site nobody has opened in two years is still billed at the same per-GB rate as one your busiest team edits daily. Deleting it feels risky, since someone might need it later; leaving it exactly as is quietly wastes budget every month. Microsoft 365 Archive gives a third option: move the whole site to a read-only, lower-cost tier without losing anything.
What archiving a site actually does
Site-level archiving takes an entire SharePoint site, not just an individual file, and moves it out of the active storage tier into cold storage. The site's files, lists, libraries, and metadata are preserved exactly as they were. What changes is accessibility: the site becomes read-only and is not available for normal browsing until an administrator reactivates it.
This is a different mechanism from file-level archiving, where individual files inside an otherwise-active site can be archived and reactivated by any reader on demand. Site-level archiving is the right tool when the entire site, not just a handful of files, has gone genuinely quiet.
Before you archive: which sites qualify
Not every quiet-looking site is actually safe to archive. Three checks are worth running before touching anything:
| Check | Why it matters |
|---|---|
| Last activity date across the whole site, not just the home page | A site can look abandoned at the top level while a single library still gets weekly edits |
| Whether the site backs a live Teams connection | Archiving a site tied to an active Team can break the connected channel's file experience |
| Any pending compliance hold or legal review | Sites under active legal hold should stay in their normal state until the hold clears |
Identifying inactive SharePoint sites tenant-wide, rather than relying on individual owners to self-report, gives a much more reliable shortlist than asking around.
Step-by-step: archiving the site
- Confirm the prerequisite. Microsoft 365 Archive must be enabled for the tenant, and an Azure subscription must be linked to cover archive storage billing. This is a one-time tenant-level setup a Global Administrator handles.
- Shortlist candidate sites. Pull a tenant-wide inactivity and storage report so the decision is based on real usage data rather than guesswork.
- Notify the site owner. Even a genuinely dormant site usually has a nominal owner. A short heads-up before the change avoids a confused support ticket later.
- Archive the site. A SharePoint Administrator initiates the move to the archive tier through the SharePoint admin center (or PowerShell, where available for your tenant's rollout stage).
- Confirm the site shows as archived. The admin center will reflect the site's new status. Users attempting to browse to it will see that it is no longer available in its normal read-write state.
See how Report Master finds archive candidates
Reactivating an archived site
Reactivation is initiated by an administrator, not by end users browsing to the site. Depending on how long the site has been archived, the return to full access can take anywhere from a short delay up to a day or more. Plan any request that depends on a reactivated site with that lag in mind, particularly if it's tied to a deadline.
Once reactivated, the site returns to its exact prior state: same permissions, same content, same version history. Nothing is regenerated or rebuilt; it simply becomes accessible again.
How this differs from deleting or trimming
Archiving, deleting, and version trimming solve three different problems, and mixing them up leads to the wrong outcome.
- Archiving keeps everything, reduces cost, removes active access. Best for sites that are done being used but might still be needed for reference.
- Deleting (via empty folder removal or full site deletion) permanently removes content. Best for sites genuinely finished and not required for retention.
- Version trimming reduces the historical bloat inside an otherwise active site without touching accessibility at all. See how to trim SharePoint version history for that separate problem.
For sites your organisation is deciding whether to keep at all, SharePoint site archive vs. delete: making the call walks through the decision itself in more depth.
Frequently Asked Questions
Does archiving a SharePoint site delete its content?
No. Everything is preserved exactly as it was. Archiving only changes the storage tier and accessibility, not the content itself.
Can users access an archived SharePoint site at all?
Not in its normal state. An archived site is read-only and generally unavailable for browsing until an administrator reactivates it, which is a different behaviour to file-level archiving where individual files stay visible and any reader can reactivate them.
Does archiving reduce the site's storage quota consumption?
It reduces the cost per GB, but the content still counts toward overall SharePoint storage accounting. To actually reduce the quota figure, content needs to be deleted or version history needs to be trimmed.