However, Disk Cleaner shows that there are currently only about 12 MB of "non-critical" MS Defender files on my hard drive. I use Microsoft Defender for my real-time antivirus protection on my Win 10 machine and can use the built-in Disk Cleanup utility at Windows Administrative Tools | Disk Cleanup | Clean Up System Files | Microsoft Defender Antivirus to safely purge any "non-critical" Microsoft Defender files. However, they must have found a workaround because I just tested BleachBit Portable v4.4.2 (Preview mode only - I didn't actually proceed with the clean) on my Win 10 laptop and 278 MB / 10 files in C:\ProgramData\Microsoft\WindowsDefender\Definition Updates\Backup were marked for deletion. The Sept 2020 github thread at Persistent Error When Deleting (Windows Defender Backups) would suggest that BleachBit developers also tried to incorporate a similar cleanup of MS Defender backup files into their disk cleaning software but ultimately removed that option because because they believed the deletion of these backup files was being blocked by Microsoft Defender's tamper protection self-protection module. The new "Windows Defender Backup" rule doesn't delete anything here (Windows 11), any ideas? (That's kind of expected as the folder should have a strong anti-tampering protection.)
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