Automatic Backups Messed my Moodle Server

Hi Moodlers,

I did set up automatic backups to run every day at exactly midnight. I backed up everything, including the course logs. I directed the backups to  /opts/backups folder where I intended to rsync(not done yet) with my local machine. Come early morning, the site can't be reached. I try to ssh to the server, but it keeps timing out. I had about 100 courses and 22k users. The server is Ubuntu 20.04, and moodle 4.4. 

Kindly help.