Information code 4103: Failed to write file.

Solution:

Please check the items below:
1) Check if your destination location has enough space to perform a backup.
2) Check if you have enough permission to read/write the destination location.
3) Check if your destination disks have bad sectors.
4) When you are doing the backup operation, you may shut down other threads that are accessing the directory of this destination.
5) Please make sure that you hook your external disks up or your network is in good condition when you fail to do the back up to external disks or NAS/Share.

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

6) Please also check if the drive letter of the destination partition or disk has been changed. You'd make sure the drive letter of the destination path keeps consistent with the one configured in the backup task.