Updated September 2026: in 2021, with a terabyte of OneDrive storage per family member, I found it hard to keep track of how much each folder used, and wished I could set limits per folder. I have rewritten it into a guide to managing and monitoring OneDrive storage.
After a few months with OneDrive as my main storage, working on files directly from the OneDrive folder on my Mac, one issue stood out. With a whole terabyte available, it was easy to lose track of which folders were growing, and there was no way to set a limit on a folder.
Can you set storage limits per folder in OneDrive?
Not in personal and family plans. Storage is a single allowance per account. Business versions give administrators more control over overall storage, but not folder-level quotas for users.
How do you see what is using space?
- On the OneDrive website, open Settings, then Storage, and choose "What's taking up space" to see the largest files.
- On a Mac, Finder shows folder sizes if you enable "Calculate all sizes" in View Options.
- Check the recycle bin, which counts towards storage until emptied.
How do you keep storage under control?
Review the largest files every few months, move old archives to an external drive, and delete duplicates. Video files are usually the biggest users; compress or archive those you rarely watch.
What about shared family storage?
On Microsoft 365 Family, each person has their own terabyte, so one person filling their space does not affect others. That separation is one of the plan's advantages.
How do you keep local disk space free?
Use Files On-Demand and "Free up space" on folders you rarely open, so they stay in the cloud.
How do you organise folders so growth is visible?
Keep a small number of top-level folders, such as Work, Personal, Photos and Archive, and put everything inside them. Checking the size of four folders is easy; checking forty scattered ones is not.
What happens if you exceed storage?
Syncing stops and, after warnings, the account can become read-only. Keep a margin.

