Version 7.9.0.404 Backup to local device fails error 1003

for the last 2 weeks I receive the following error after backup completes.
It looks like the backup was successful. but we still get the error.

• An error occurred (code: 1003)
Incorrect function. Position 1358513664 count : 512 . ErrorCode:1 HR:80070001
Please contact support

any idea what this means or how to resolve it?

When we first got the error we were running version 7.8.7.59. But it still occurs after updating to the latest build.