Hello, I have my own dedicated server with 7 different sites (New bee to dedicated). I have WHM root access.. Please advise on listed questions

1 ) How can i download the whole site's backup one time through WHM (7 accounts)..?

2 ) If i have backup setup in the server, how do i restore last days SQL data for one account...?

3 ) How do I restore the back up..??

Thank you so much in advance for the reply