Windows 10 Windows 10 Backup Failed: Error code 0x81000019

[RobertM525]

The error message says,

A shadow copy could not be created. Please check "VSS" and "SPP" application event logs for more information.​

Details: the writer experienced a non-transient error. If the backup process is retried, the error is likely to reoccur.​

I have written a system image to my external drive once but this process has never completed.


I'm backing up to an 8TB (Windows says 7.28 TB) WD MyBook that currently has 5.98 TB free. (The only thing on it is the system image I wrote to it as soon as I bought it a week ago.) In "Manage Windows Backup disk space," it reports the following:

Data file backup: 0 bytes​

System image: 1.25 TB​

Other Files: 50.32 GB​

Free space: 5.98 TB​

Total size: 7.28 TB​

In Event Viewer, there are two seemingly related errors.

Windows Backup​

Level: Error​

Event ID: 4100​

Backup did not complete successfully because a shadow copy could not be created. Free up disk space on the drive that you are backing up by deleting unnecessary files and then try again.​

EventData:​

A shadow copy could not be created. Please check "VSS" and "SPP" application event logs for more information. (0x81000019)
19000081980500004409000060090000420ED1665C2BEE174B64529CB14610EA71000000​

SPP​

Level: Error​

Event ID: 16387​

Writer ASR Writer experienced some error during snapshot creation. More info: System partition (partition marked "active") is hidden or contains an unrecognized file system. Backup does not support this configuration. (0x80042416).​

EventData:​

ASR Writer
System partition (partition marked "active") is hidden or contains an unrecognized file system. Backup does not support this configuration. (0x80042416)
The writer experienced a non-transient error. If the backup process is retried, the error is likely to reoccur. (0x800423F4)
System partition (partition marked "active") is hidden or contains an unrecognized file system. Backup does not support this configuration. (0x80042416)
01000000C6120000A71200000000000042BEB7C511CAC619E59C92030000000000000000​

System details:


Windows 10 Home 64-bit (Version 10.0.18363 Build 18363)
CPU: Intel Core i5 @ 3.20GHz
RAM: 16.0GB
Motherboard: Gigabyte Technology Co. Ltd. H97-D3H-CF (SOCKET 0)
Graphics:
ROG PG248Q (1920x1080@144Hz)
HP 2159 (1920x1080@60Hz)
Intel HD Graphics 4600 (Gigabyte)
XenSource Citrix Indirect Display Adapter (Undefined)
2047MB NVIDIA GeForce GTX 960 (EVGA)
ForceWare version: 456.71
SLI Disabled
Storage
Samsung 860 EVO 500GB (SATA SSD)
Toshiba HDWE140XZSTA 4TB (SATA HDD)

Samsung SSD 840 EVO 250GB (SATA SSD)
Western Digital WD My Book 25EE 8TB (USB)
Audio
Realtek High Definition Audio

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