63780: Acronis Backup: SQL database backup fails with "An invalid file has been detected"

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Issue

Backup plan, applied to an SQL server database fails with this error:

Error code: 5701903
  Fields: {"$module":"ArsAgentProvider_vs_14800","IsReturnCode":1}
Message: Failed to back up Microsoft SQL Server.
 ------------------------
 Error code: 22872404
 Fields: {"$module":"ArsDbBackupProvider_vs_14800"}
 Message: Cannot resolve file path 'xxx'.
 ------------------------
 Error code: 22872371
 Fields: {"$module":"ArsDbBackupProvider_vs_14800"}
 Message: Failed to resolve file path 'xxx'.
-----------------------
 Error code: 22872396
 Fields: {"$module":"ArsDbBackupProvider_vs_14800"}
 Message: Cannot open file 'xxx' in directory 'C:\WINDOWS\system32\'. 
------------------------
 Error code: 22872368
 Fields: {"$module":"ArsDbBackupProvider_vs_14800"}
 Message: An invalid file has been detected.  

Cause

LocalDB is installed on server  and configured to use drive that does is no longer available.

Solution

Stop the LocalDB instance and run backup. It should compelete successfully.