Microsoft 365 Archive vs trimming version history: which fixes SharePoint storage?
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The storage warning arrives and the first instinct is to buy more space. Before you do, it helps to know what is actually using it. In most tenants the answer is a mix of two things: whole sites nobody opens any more, and active libraries carrying years of old file versions. Those need different fixes.
What does Microsoft 365 Archive cost?
Microsoft 365 Archive is billed per GB per month through pay-as-you-go, and only when archived storage plus active storage goes over the tenant's licensed SharePoint quota. If you are still under quota, archiving costs nothing extra. Microsoft removed the fee for reactivating archived SharePoint content on March 31, 2025; archived OneDrive accounts still have a reactivation fee. Check the current per-GB rate on Microsoft's pricing page.
- Archived sites stay searchable by admins and keep compliance features, but users see a "site is archived" message.
- Archived content is left out of Microsoft 365 Copilot results.
- Once you reactivate a site, you cannot archive it again for four months.
What does trimming version history do?
Version history settings decide how many old copies of each file SharePoint keeps. Lowering the limit, or switching a library to Automatic mode, stops old versions from piling up. The change applies to new versions, and trimmed bytes sit in the recycle bins for up to 93 days before quota frees up. The full set of options is in SharePoint version history settings explained.
Which one should you use?
| Situation | Best lever |
|---|---|
| Finished projects or old team sites nobody opens | Microsoft 365 Archive |
| Busy libraries where files are saved many times a day | Trim version history |
| Old content that should not show up in Copilot answers | Microsoft 365 Archive |
| Growth from new, current content | Buy extra storage |
| You don't yet know where the space went | Measure first |
Measure before you decide
SharePoint's built-in Storage Metrics shows totals, not where version history sits. The free Smart Storage Analyzer web part has an optional "Include version history size" toggle that shows the size of each file's old versions next to its current size. It measures only and deletes nothing. Folder and site totals do not include version history, so look at the file level to find the libraries worth trimming. See how to find what is using SharePoint storage.
Related resources
Want a second opinion on your storage plan? Our team can review where your space is going and which lever fits. Contact us.
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Comparing expensive licenses?
Skip the license and let our consultants do the work
Instead of paying for a software license you may only need once, hire our team to build your storage cleanup plan using the free tools on this site. You get a fixed scope and hands-on help, not another subscription.
About the author
Sean Regan
SharePoint & Microsoft 365 consultant with 20+ years of hands-on experience building SPFx web parts, migration tooling and tenant-grade automation. Maintainer of the open-source SharePoint Smart Solutions suite.