unless something goes wrong - you don't need to do anything
if it does - you will end up paying some geek $100/h to fix it
for me it is less expensive to pay someone when sth is wrong as having managed servers - and i have 3 hexa core servers now
also if sth is very very wrong or servers being hached - just get new servers and extract backups / move users - way cheapper and faster as fixing
I like direct admin too + they have good support that fixed my servers for free ( error was on DA side)
also fuck vps, get dedicated servers - if you cant afford them - go look for a job and stop wasting your time on GFY