Since my early start in computers i regularly cleaned up the insides, cleaned fan's or replaced them if needed, keep the dust out of your stuff including transceivers PSU's and P.A.'s , they will reward you with longer faultfree life.
Even this lappy gets a clean out every 4 to 5 months including taking the fan out and clean the heatsink heatpipe and fan.
My lappy is on a plate with 2 extra fans keeping the underside cool as well, so the inside keeps cool as well.
My last laptop survived 8 years 12 hours a day on that way without a hickup.
My son's game computer has 6 fans that need regularly cleaning including cleaning the heat sinks, and the rest of the innards.
I run a backup on my spare USB H.D. every month, not much gets added but that way i'm always good for a relative recent install.
I now, as long it works we mostly don't care, only when you need it the misssing back up kills you...