Hi MM,
Welcome to Microsoft Community.
I'm Hahn and I'm here to help you with your concern.
I'm sorry to hear that you lost your unsaved snips. I can try to help you with some possible solutions.
- Check the Clipboard history: Press Windows key + V to see if your snips are still in the clipboard. If they are, you can paste them into another app and save them.
- Check the TempState folder: Go to %LOCALAPPDATA%\Packages\Microsoft.ScreenSketch_8wekyb3d8bbwe\TempState and see if you can find your snips there. If they are, you can copy them to another location and save them.
I hope these methods work for you and you can recover your snips. If not, I'm afraid there is no other way to get them back.
I agree that it would be better if Windows 10 could automatically save your unsaved snips when it updates, or at least warn you before restarting. Maybe this feature will be added in the future updates. For now, I suggest that you save your snips as soon as you capture them, or enable the Auto copy to clipboard option in the Snip & Sketch settings, so that you don't lose them again.
Microsoft attaches great importance to user experience, you can submit your ideas and suggestions through the****Feedback Hub, and the development team will regularly review submissions for ideas or fixes.
Please share the feedback link here after submitting as it will allow others on the forum to vote for your submission, including me. More votes will lead to more visibility and higher priority to the development team.
If there is anything not clear, please do not hesitate to let me know.
Your Sincerely
Hahn - MSFT | Microsoft Community Support Specialist