I don't see any iCloud backups other than my last iOS18 backup

I didn't make a local backup using iTunes. I can do it now. I had to install iOS 18 beta 4 again and I restored my last iCloud backup. If I will make local backup using iTunes now using 18 beta 4 I should be able to restore it afrer downgrading to 17.5.1? It was not possible using iCloud iOS 18 backup. Regards, Chris