If your Windows PC suddenly says “Reconnect your drive” in File History—even though the USB drive is plugged in and working—you’re not imagining it. Microsoft’s September 2026 security updates broke File History backups for some Windows 10 and Windows 11 PCs. Photos, tax folders, and school files that you thought were protected may not have a fresh copy.
What broke (in plain English)
File History is the built-in Windows tool that quietly copies your Libraries, Desktop, Contacts, and Favorites to an external drive or network location. After the September 2026 updates, some PCs can’t create or update those backups. Windows may show “Reconnect your drive,” the Last backup date stops moving, or previous versions say they’re unavailable—even when the drive is healthy.
This is a software glitch, not proof your hard drive died. Still treat it as urgent: until File History runs again, new files aren’t getting that automatic second copy.
2-minute check for Strasburg and I-70 home PCs
- Plug in the external drive you use for backups (same port if you can).
- Open Control Panel → System and Security → File History.
- Look at Last backup. If it’s days or weeks old—or missing—keep going.
- Click Run now (if you see it). Watch for errors or an instant “Reconnect your drive” message.
Also open File Explorer, right-click an important folder → Properties → Previous Versions. Empty or “no previous versions” after a successful history is another red flag.
Fixes worth trying at home
1) Confirm the drive itself is fine
Open the drive in File Explorer. Can you copy a small test file onto it? If the drive won’t open, try another USB cable/port, or test the drive on a second PC. File History can’t save what Windows can’t write.
2) Turn File History off, then back on
In File History, choose Turn off, wait a minute, then Turn on and select the same drive. Run a backup manually. Sometimes Windows just needs a clean reconnect after an update.
3) Pick the drive again
Use Select drive and re-choose your backup disk (or a different spare drive temporarily). If a second drive works and the first doesn’t, the first drive’s filesystem or cable is the culprit—not the September bug.
4) Install the latest Windows updates
Microsoft often ships follow-up fixes after a bad Patch Tuesday. Go to Settings → Windows Update, check for updates, install everything offered, restart, then try File History again. If Windows Update itself is stuck, use the checklist in our related post: Windows Update stuck or failing.
5) Make a manual copy today (don’t wait)
While you wait on a permanent fix, drag your Desktop, Documents, Pictures, and any tax/business folders onto the external drive in a dated folder like ManualBackup-2026-09-23. It’s not fancy versioning—but it beats losing the week’s work.
Better than “hope File History comes back”
File History is helpful, but it’s not a full disaster plan. Along the I-70 corridor I set folks up with a simple two-layer approach:
- Local copy on an external drive (File History or a scheduled copy).
- Cloud backup (I often recommend IDrive for multi-computer homes; OneDrive or Windows Backup can cover settings/files too).
Ransomware, a stolen laptop, or a house fire doesn’t care that Patch Tuesday went sideways. If your only backup lived on the same PC—or on a drive File History can’t talk to—you’re exposed.
When to call for help
Call or text if: File History still fails after updates and a drive reselect; you see disk errors; you need years of photos migrated safely; or you want cloud + local backup set up the right way. I’m Carl Gerber — Carl the Computer Guy — based in Strasburg, helping homes and small shops from roughly Limon to the Denver metro edge. 720.281.4990 · carlthecomputerguy.com.
This post is practical home-PC guidance, not legal advice. Always keep your own copies of irreplaceable files.
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