How to fix: 0x800423f4, The writer experienced a non-transient error. If the backup process is retried, the error is likely to reoccur

backupsoftwareforharddrivesbannerFixing this error may be a little tricky:

0x800423f4, The writer experienced a non-transient error.  If the backup process is retried, the error is likely to reoccur

However, the reason is usually a service vetoing the backup.
If it’s the Hyper-V VSS Writer reporting this error, check all Hyper-V logs

as shown here //backupchain.com/hyper-v-backup/Troubleshooting-First-Steps.html

There’s now a tool to help you do this called VssDiag

Also note that each VM has the capacity of break the backup process on the host; hence you may need to check each VM’s Event Viewer logs for errors, too.

As always, we recommend switching to BackupChain 😉

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