I have a hidden file on my C: drive named
$WINRE_BACKUP_PARTITION.MARKER, of size 0. I don't know when it appeared there and couldn't find any relevant information about it online.
Does anyone know what it does, and if it's safe to delete?
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This file also exists on machines that have not failed any update process. It has nothing to do with updates, though it may appear after an update as a consequence of attempting operations on an absent recovery partition (a better guess than the one above).
I have seen this on a variety of machines, all of which had Windows 10 installed as a single partition with no recovery. Deleting it has never caused issues with normal use.