Answer in brief: You have four dependable levers - optimize what you have, archive what you don’t need active, buy more SharePoint storage, or shift the right workloads to the right place (e.g., OneDrive for personal files, large non-collaborative files to LOB systems designed for them). In practice, most tenants combine them: trim versions and recycle bins, archive inactive sites with Microsoft 365 Archive for cheaper cold storage, and only then purchase extra capacity as needed.
Below, we'll show the pros/cons, costs, and when to use each - with admin steps and references.
Why you’re running out of SharePoint storage (and what to fix first)
Before reaching for your credit card, validate the biggest drivers of growth:
- Version history sprawl - In SharePoint/OneDrive, each major version counts as a full copy for storage. Microsoft’s Version history limits (Automatic / Manual with count & expiration) let you significantly reduce the footprint, especially for PowerPoint- and media‑heavy libraries.
- Recycle bins - Deleted items remain recoverable for 93 days and still count against your quota until they’re purged. Empty the first- and second‑stage recycle bins to reclaim space quickly.
- Old/inactive sites - If a site hasn’t changed in months, it’s a candidate for archiving (see Option 2).
Tip: Microsoft’s storage is pooled across the tenant: 1 TB base + 10 GB per licensed user; each site can grow up to 25 TB. Use automatic pooled site limits unless you have special reasons to cap sites manually.
Option 1 — Optimize your existing allocation (quick wins first)
If you need immediate space back without new spend while you work on long-term planning, there are a few relatively quick steps you can take.
What to do
- Empty recycle bins (both first- and second‑stage) on large sites. Consider a quarterly clean-up process.
- Move personal working files to OneDrive - OneDrive storage is separate from SharePoint’s pooled quota and for most plans provides 1 TB per user, so moving files not suited to team sites to OneDrive can contribute to savings. NB: This should be approached cautiously, as OneDrive sites are automatically deleted when user accounts are removed, potentially putting valuable information at risk of being lost.
- Trim versions - On most tenants, 10-30% of storage is consumed by versions other than the latest. This action is most effective on large sites, and sites which contain many large files.
- Set Version history limits at the organization level (Automatic is recommended). This will only apply to newly created sites, so you will need to manually set libraries in the largest sites to have an effect on existing content.
Considerations
Lowering version limits slows future growth but doesn’t reclaim existing bloat unless you trim also trim. Plan one‑time trimming on heavy sites as an initial high-impact action.
Option 2 — Archive inactive content with Microsoft 365 Archive (lower‑cost cold storage)
If content must be retained but isn’t needed for day‑to‑day collaboration, Microsoft 365 Archive moves entire SharePoint sites to a cold tier. Archived sites don’t consume active SharePoint storage and remain discoverable for admins/eDiscovery; end users can’t browse them until you reactivate.
This works best for Project or department sites that are inactive but must be retained, and you want ongoing savings on this content instead of buying standard storage.
Why admins choose it
- Cost efficiency: Archive storage is metered on a separate, lower‑cost tier than standard SharePoint storage. It’s explicitly designed to reduce active storage costs while preserving security/compliance. (See Microsoft’s archive docs and FAQs for billing and behavior details.)
- Governance: This cleanly separates active vs inactive content.
How it works (high level)
- Enable Archive (PAYG billing required) and select candidate sites in the SharePoint admin center. Reactivation is supported in‑place when needed.
- File‑level archive is entering preview with additional prerequisites; during preview it’s toggled via PowerShell and has specific visibility/limitations. Site‑level archive remains the primary, storage‑reducing lever today.
Considerations
Until file-level archiving is fully available, site‑level archiving limits practical feasibility of the archive process. It's not possible to designate a site as an archive and move content into it over time, it has to be archived as whole and is then inaccessible except for compliance and eDiscovery purposes.
Option 3 — Purchase more SharePoint storage
When optimization and archiving aren’t enough (or you need headroom now), you can buy SharePoint Storage in 1 GB increments from the admin center.
Decision guide: Which lever should you pull first?
Logical sequence
- Free up what you can with version history trimming and limits - often a double‑digit % reduction on heavy sites.
- Archive inactive sites for recurring savings vs paying standard SharePoint rates for cold content.
- Buy storage to create safety buffer and support ongoing growth. Microsoft’s add‑on is the official, supported way to scale tenant capacity.
Mini‑FAQ
Does SharePoint automatically reallocate space between sites?
Yes. With Automatic site storage, SharePoint draws from the pooled tenant storage so you don’t micro‑manage quotas (each site can grow up to 25 TB).
If I use Microsoft 365 Archive, do users still find files in normal search?
No - end users won’t see archived content in regular SharePoint search while it’s archived. Admin/eDiscovery access remains available; reactivation restores normal access.
Will file‑level archiving save storage right now?
In the public preview, archived files don’t change site storage accounting. Use site‑level archive to reduce active storage today; watch Microsoft’s FAQ/roadmap for updates.
Do recycle bins count against storage? For how long?
Yes. Deleted items are retained for up to 93 days and count toward your quota until permanently removed.
How much OneDrive space do users get?
Most plans include 1 TB per user by default; eligible tenants can increase to 5 TB (and more by request) under defined conditions.
How SProbot can help
If you’re aiming to avoid buying storage prematurely (or again), SProbot’s approach is to surface the biggest, safest savings first - version‑heavy files, and long‑inactive files and sites - so you can confidently archive or delete what doesn’t need to live in active SharePoint storage.
For a hands‑on walkthrough, start here:
- How to get a SharePoint Online health check → visibility of the biggest problems fast.
- SharePoint storage limit exceeded? 6 proven ways to reclaim space → quick wins before spending.
- How to trim versions to increase available SharePoint storage → curb version sprawl.
- How to find and remove inactive files → target cold content.
- Easy SharePoint storage win: Archive or delete inactive sites → lifecycle control.
- How much is SharePoint storage? Cost and capacity explained → budgeting perspective.
