Input backing up a php script and DB

[Nasdaq]

hello, so i am needing to back up my website because it generates content and is starting to become very heavy. what are my best options and what exactly is not carried over ? i messed this up years ago, but do not want it to happen again. is there a way to possibly do this but default all of the plesk settings? i just want almost like a refresh but if there’s something i changed wrong years ago when i first set it up i’d rather get it fixed! thanks for all the help in advance.

 

[Nasdaq]

can anyone help or am i in the wrong place for something like this?

 

[Bitpalast]

Would not the Plesk backup function be the right way to go?