Seems to be a problem with the “%c” placeholder. There seem to be no quotes around the filename, making it interpret the date/time as a new parameter starting with the “Oct”.
Actually, this might qualify as a VMin bug, since either the %c placeholder should be supported and the quotes should be there, or there should be a warning about using placeholders that can expand to text with spaces.
Do you have “Do strftime-style time substitutions on file or directory name” checked for the backup? What happens when you omit the “%c” for a test? You might want to use file name placeholders that don’t contain spaces. Click the “time substitutions” checkbox link for a popup with available placeholders.
Okay, if none of the coders read this here, you might wish to post this as a bug report in the Issues section. At least I assume it can be considered a bug, as explained before.