It was just a simple file-by-file backup of the whole system partition about half year ago. Today i was clearing space and found two hidden files:
I could not delete them and do anything at all. Tried to apply attributes and got this error:
Also what I found strange is that when i measured how much space all files take on hard drive and here is what I saw:
But when I measured the partition itself, it was telling me that files were using over 13GB more space:
