What does HRESULT 0xC00D2745 (NS_E_BACKUP_RESTORE_BAD_DATA) mean?

NS_E_BACKUP_RESTORE_BAD_DATA

What this HRESULT isolates

When the client returns NS_E_BACKUP_RESTORE_BAD_DATA (0xC00D2745), the decisive condition is backup/restore data fails format or integrity validation. This result belongs to license backup, restore and anti-abuse state, specifically the backup/restore workflow that enumerates eligible licenses, writes a backup set, sends restoration requests to the license-management service and reconciles restored state with the target machine.

The built-in message summarizes the user-visible outcome, while the symbolic phrase “backup restore bad data” preserves the exact WMDRM boundary for diagnosis. For this code, the proof step is to capture member identity, size, hash and the stage receiving the data.

Minimum incident record

Capture the first NS_E_BACKUP_RESTORE_BAD_DATA occurrence before retry or teardown changes state. The smallest useful record contains:

• Code-specific proof: capture member identity, size, hash and the stage receiving the data.
• Protected identity: service response, reset count and daily restore limit.
• Operation state: target machine identity and final license-store commit.
• Persistence or transport: backup or restore operation ID.
• Security context: backup directory contents and manifest consistency.
• Correlation point: per-license backup/restore eligibility.

Prefer IDs, hashes, sizes, and timestamps. Never log keys, passwords, licenses, or decrypted media.

Triage without destroying evidence

1. Start from 0xC00D2745 and map it to the first WMDRM object that returned it.
2. Separate content/header evidence, license evidence, machine/device evidence and service/network evidence around “backup restore bad data”.
3. Before retrying NS_E_BACKUP_RESTORE_BAD_DATA, check whether another “backup restore bad data” operation was active or whether the previous result may have committed partially.
4. Apply the smallest supported fix: replace the damaged backup material rather than retrying the same bytes; avoid resetting unrelated protected state.

Why the producing layer matters

Two platform rules frame NS_E_BACKUP_RESTORE_BAD_DATA. Only licenses carrying the backup/restore right are eligible, and licenses with secure state can be intentionally excluded by the issuer. Backup and restore are multi-stage asynchronous operations; one damaged member or a stale request identifier is not equivalent to an unavailable service.

Recovery at the right layer

The supported response to NS_E_BACKUP_RESTORE_BAD_DATA is narrow: replace the damaged backup material rather than retrying the same bytes. After correcting NS_E_BACKUP_RESTORE_BAD_DATA, reopen or recreate the object that owned “backup restore bad data” so cached state from the failed generation is not mistaken for the repair result.

Representative case: A backup member is truncated in transit to the restore service.

Why the symbolic name matters

Order the NS_E_BACKUP_RESTORE_BAD_DATA event chain by timestamp; prefer the earliest specific result.

Shortcuts that make diagnosis worse

• Avoid merging files from different backup sets or inventing request identifiers. That changes evidence without demonstrating why NS_E_BACKUP_RESTORE_BAD_DATA was produced.
• Avoid repeatedly resetting or restoring until anti-fraud limits are reached. That shortcut can create a second store, identity or policy problem.
• Do not reduce NS_E_BACKUP_RESTORE_BAD_DATA to “DRM failed” in telemetry; retain the HRESULT, symbolic name, operation and object identity.

Completion criteria

A valid regression for NS_E_BACKUP_RESTORE_BAD_DATA has two fixtures: one that deliberately produces “backup/restore data fails format or integrity validation” and one that applies the targeted correction. Compare callback order, selected license/KID, final rights decision and persistence state; disappearance of the “backup restore bad data” dialog alone is not proof.

Code-specific operational note

The symbolic phrase “backup restore bad data” is the important search and telemetry key for NS_E_BACKUP_RESTORE_BAD_DATA. Keep it beside the exact value 0xC00D2745; the official message “Bad Data sent to Backup-Restore.” is useful to users, but it does not identify the producing API, object generation or protected identity on its own.

Technical references

• Backing up and restoring licenses — official Windows Media DRM context for NS_E_BACKUP_RESTORE_BAD_DATA.
• Backup/restore model and eligibility — API and state rules relevant to this boundary.
• DRM client interfaces — platform documentation used to distinguish this result from adjacent results.
• DRM client structures

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