With my EC hat on, documentation was a 'norm' for 25 years. "As-built" red line prints, dimensions from immovable objects for U/G work, & daily/weekly notes.
The digital age made life a lot easier!
File back-ups, first on 5-1/4 disc, then 3-1/2 then tape, wow that was cool. Progress on to CD's, DVD's, flash drives & back-up hard drives....then put down the tools.
I handed over a lot of documentation to the guy that bought the trucks, tools & materials, along with the client list. Invoices going back to 1980 (digital) are still in my possesion, along with insurance policies, etc.
As an AHJ....documentation as required is SOP & CYA.