On three separate home pc's my scheduled backups have failed to run, and when I try to manually start the backup I see the status shows 'running' for a couple of minutes before failing with error 0x1f6 or 0x1f4, (see attached screen grab).  Strangely there is NO corresponding entry in the log section to elucidate any further, (see screen grab).

I have of course tried re-booting the PCs and re-starting the backups manually, but with the same result in each case.

Do you have any further advice?

Can't be of much help but have a look at:
http://wikifixes.com/en/errors/0x/0x1f4/?gclid=CKuS2KbyntICFR62wAodbWwH_Q
This is not an endorsement of the fixing software mentioned or anything else since I don't know anything about it.

Since you have the problem on multiple PCs are you using a common target for the image such as a NAS drive or the same external USB drive or whatever?  If so, try writing to a different device. It looks like you are attempting an incremental, try writing a new full. The Windows error 0x1F (without the 4) indicates a bad device but there are probably lots of reasons that could be returned either hardware or software.

These errors have also been associated with Task Scheduler issues discovered under Win10 Anniversary Edition.

A bit more Googling reveals that they may be related to a recent Avast Anti-Virus update which Macrium are seemingly aware of.  I don't know if there's any ETA for a fix, but disabling Avast's 'self protection' seems to be a temporary, (if partially unsatisfactory) fix.  Any update from Macrium staff??

Hello

An update has been released which should help with the issue.

The root cause of the issue lies with Avast. If you have a valid support subscription with them please submit a ticket on their helpdesk (if you still experience issue). 

Kind Regards

Stephen

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