Error Code 4103: Failed to Write File

Solution for Error Code 4103: Failed to Write File.

Lily

By Lily Updated on November 13, 2025

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This article applies to: AOMEI Backupper all versions.

Introduction

In a few cases, when you choose to do a backup of any kind, you may encounter Error Code 4103: Failed to write file.

 

Backup is initializing...

Backing up the information of storage device...

Backing up of the volume 0...

Backing up data...

Backing up of the volume 0 done.

Backing up of the volume 1...

Backing up data...

Backing up of the volume 0 done.

Backing up of the volume 2 (C:)...

Information Code:4103

Failed to write file.

Error 4103

Solution 1

Please check the items below:

1. Check if your destination location has enough space to perform a backup.

2. Check if you have sufficient permission to read/write to the destination location.

3. Check if your destination disks have bad sectors.

4. When you are doing the backup operation, you may shut down any other threads that are accessing the directory whereof this destination.

5. Please make sure you hook your external disks up.

6. Please check if the external drive is disconnected or its drive letter is changed when you back up to an external drive. Please reconnect the external drive with the same drive letter as the target path.

7. Or, the NAS is disconnected because the unstable network or user account is changed when you back up to NAS. Please delete the NAS.xml file under C:\ProgramData\AomeiBR, and then reconnect the NAS by typing the IP address.

Solution 2

If you failed to back up to NAS/Share (network drive), please make sure your network is in good condition. Or you can map the NAS/Share (network drive) as a local drive in Windows (it applies to v3.2 and lower versions). You can refer to the screenshot below to map your network folder.

Map Network Drive

After mapping the folder successfully, you can back up to the directory of the network folder just like backing up to a local location.

Backup to Mapped Drive

If there is still any problem, please feel free to contact us.

Lily
Lily · Editor
Lily Green joined AOMEI in 2018 and has since become a professional in the areas of data protection and data transfer. She is committed to helping users protect their precious computer data and troubleshoot Windows system errors. She consistently stays vigilant about the latest trends in technology, guaranteeing that the given information aligned with the ongoing advancements in the field.