System Cleaner - backup files


I’m new to this forum and I couldn’t find any mention of my query when I searched and I can’t believe that this hasn’t been asked previously.

I noticed that Comodo System Cleaner has created some huge files on my disk that have extension CBU - I believe that this are used to restore, should it be necessary after using the System Cleaner - but some of these are a year old and I can’t believe that I would ever want to restore that far back - but I can find no way of managing these files so I can delete the old ones - I’m reluctant to delete them from disk until I have a better understanding if I’m missing something

Thanks for your help