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Can I recover my overwritten or deleted file?

Answer three questions and get an honest verdict — even when the honest answer is "no". Whether you can get a file back comes down to one thing almost nobody tells you first: where the file lived.

The rule of thumb

Where the file lived Can you get it back?
Cloud drive with version history on ✅ Almost certainly — restore from version history
Local disk or NAS, with a backup / snapshot made beforehand ⚠️ Only if the safety net was set up in advance
Local disk, overwritten, no backup ❌ Almost certainly not — and don't buy recovery software

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Straight answers

I saved over a file on my own computer with no backup — can I get it back? ▼
Almost certainly not. A local file you saved over, with no backup, is nearly impossible to recover on a modern SSD. The overwrite plus the SSD's TRIM command have most likely already erased the old data — don't spend money on recovery software that claims otherwise. Rebuild from old email attachments, exports, preview thumbnails, or a colleague's copy instead.
A file on my cloud drive got overwritten — is it recoverable? ▼
Yes, almost always — if version history was on. Open the file on the web, find Version history, and restore the version from before the change. Even if you think it was off, check the cloud Recycle Bin: deleted items usually linger about 30 days.
A shared file on our NAS was overwritten by a colleague — can we restore it? ▼
It depends entirely on whether snapshots were turned on beforehand. If your NAS or IT enabled folder snapshots, restore the file from the snapshot taken before the change. If no snapshot existed, the overwritten version is gone — the cloud's version history does not reach files that live on a NAS or a local disk.