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Multiple Error Codes on Backup Failure

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Acronis True Image 2021, Build 30480, running on Windows 10 Home, Version 2004, Build 19041.508. 

Back up is to a WD Elements 4TB external hard drive via USB.

Back ups were failing, then began succeeding, then began failing again.

The failed backups report "Unknown status" with the following eight error codes:

0x000B03EC 

0x02160015

0x00070021

0x0010C443

0x00000009 

0x00F2001F

0x0000FFF0 

0x8007001F

The Acronis KB simultaneously reports: "We found two results which are similar to your error." and "Search found 0 items."

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Sorry but too little information to be able to guess at what is wrong here?

What type of backup?  Disks & Partitions or Files & Folders?

What is being backed up?  Local drives/partitions, network drives etc?

What are the actual error messages shown in the log, not just the codes?

There is a new log viewer tool that has now been made available by Acronis via the Community Tools KB page.  See the link in my signature for the MVP Assistant tool.  Please use this or post zipped copies of the actual source log files.