Sites infinite loading

I use AlmaLinux 8.8
I am here because today I found the sites are doing infinite loading.
I have recent backups.
Can anyone help me understand the problem, please?
I removed older backups, maybe the server got stucked in the process of creatinig the backup files because of harddisk space, the last backup directory is uncomplete.
I did not install Cloudlinux. Why is this using the most of the CPU?
I tried installing Rkhunting but it got stuck in the process.