Microsoft: September updates break File History backup feature

What happened

Microsoft warned that the built-in File History backup feature in Windows may stop working on some systems after installing the September 2026 security updates. [...]

Why it matters

The development may change operating conditions or market expectations around Microsoft. Further confirmation and measurable outcomes matter.

Affected entities

View evidence

4 reports · 1 original report · 2 independent

1. BleepingComputerPrimary source · Supports · EN · 100%
   Microsoft: September updates break File History backup feature ↗Sep 21, 2026, 7:45 AM
2. BleepingComputerPrimary source · Supports · EN · 50%
   Microsoft reminds admins to migrate Entra ID users to passkeys ↗Sep 21, 2026, 9:16 AM
3. BleepingComputerPrimary source · Supports · EN · 59%
   Microsoft: September Windows updates break Always On VPN connections ↗Sep 23, 2026, 7:18 AM
4. The Hacker NewsIndependent · Supports · EN · 49%
   Fake LastPass Authenticator Installer Abuses Microsoft-Signed Driver to Kill Antivirus and EDR ↗Sep 21, 2026, 1:31 PM

Claims

• Microsoft: September updates break File History backup feature Observed

Conflicts

No material conflict detected in the available evidence.

Timeline

1. September 21, 2026 at 7:45 AMFirst reported
2. Sep 21, 2026, 2:08 PMUnverified · 63/66%

Market move following event

Market reaction is not yet available for this asset and time window.

Score explanation