Running FreeFileSync as Administrator isn’t inherently “wrong,” but it does expand the blast radius if something goes sideways. Since you’re already comfortable with elevated workflows, I’ll cut straight to the real risks — the ones that matter to someone who cares about data integrity, permissions, and system safety.

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⚠️ Key Risks of Running FreeFileSync as Administrator

🔓 1. You can accidentally overwrite or delete system‑critical files

When FreeFileSync runs elevated, it can modify anything the SYSTEM account can touch:

• C:\Windows
• C:\Program Files
• Service directories
• Driver folders
  A misconfigured sync job or wrong-side copy can nuke files Windows depends on.

As yourself: Windows blocks most of these operations
As admin: Nothing stops it.

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🧩 2. Permission inheritance problems

If you sync or copy files as Administrator, the resulting files may inherit Administrator-only ACLs.

That leads to:

• Your normal user account being unable to open files you synced
• Confusing permission mismatches
• Needing to reset ACLs manually with icacls or takeown

This is one of the most common “silent” issues.

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🛡️ 3. Elevation bypasses UAC — malware or scripts inside synced folders gain more power

If a malicious file exists in a synced directory (even accidentally):

• Running FreeFileSync as admin means it can execute post-sync scripts with elevated rights
• A compromised destination path could overwrite protected system files

Running as yourself limits the damage to your user profile.

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🔄 4. Symbolic links and junctions become dangerous

FreeFileSync follows symlinks depending on settings.
As admin, this can lead to:

• Traversing into system directories unintentionally
• Syncing or deleting content outside the intended folder tree
• Infinite loops if junctions point back to parent folders

As a normal user, Windows blocks many of these traversals.

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🧨 5. Batch jobs become high-risk

If you automate FreeFileSync with scheduled tasks running as admin:

• A bad filter rule
• A changed folder structure
• A typo in a path
  …can cause catastrophic system-wide changes.

Running as yourself naturally sandboxes the damage.

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🗂️ 6. Network shares behave differently

Admin context can:

• Access hidden admin shares (C$, ADMIN$)
• Overwrite files on remote machines you normally couldn’t
• Break permissions on NAS devices by writing with elevated credentials

This can cause permission drift across your network.

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🔍 7. You lose the safety net of “access denied”

Those errors are annoying, but they’re also a guardrail.
Running as admin removes them.

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🧠 When running as admin is justified

There are legitimate cases:

• Syncing inside Program Files
• Backing up system configuration folders
• Working with VSS snapshots (in paid versions)
• Syncing to drives with restrictive ACLs

But it’s best to elevate only the specific job, not the entire GUI.

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