Over-quota data loss: downgrade, lose write access, then watch files be deleted
Ongoing policy
If a Dropbox account exceeds its (often downgraded) storage quota, users may lose the ability to sync, upload, share, move or even preview files — and if it stays over the limit, Dropbox 'may delete files you own' to force the account back under quota.
What happened
Dropbox's 'Exceeding storage space on Dropbox Basic' help page sets out a graduated penalty for being over quota. First come restrictions: while over the limit "you may not be able to sync, upload, share, move, or preview files and folders" — in practice a read-only, partially frozen account. If the account "remains over the limit, Dropbox may delete files you own to bring your account below the storage limit," starting with the least-recently-modified files. Deleted items go to the Deleted files tab for 30 days before permanent removal, and Dropbox says it sends email warnings before deleting anything.
The scenario most users hit is a downgrade trap: someone on a paid plan accumulates far more than the 2 GB Basic allowance, then cancels or lapses to Basic and is immediately over quota with no realistic way to get back under it except deleting data or re-subscribing. Dropbox Community threads are full of users who report being unable to delete files to free space, seeing only an 'upgrade' prompt, or losing edit access to documents they still own.
This is a documented, current policy rather than a one-off event; the representative year reflects the period the current help-center wording and the bulk of complaints fall in.
Impact
The policy converts a billing lapse into potential permanent data loss: a user who downgrades and doesn't act can have their own files deleted by Dropbox. Because the over-quota state also blocks moving or downloading in some cases, users describe a frustrating squeeze in which the only frictionless exit is to pay again. It is a recurring driver of the broader complaint that Dropbox's storage model holds users' own data hostage to their subscription status.