Having just restored a large library I'll second this.

Knowing that five albums were missing was only due to my having taken a snapshot of before and compared it to the after.

BB King, REM, Bjork. Totally random. Bjork turned out to be corrupted, again, would have been good to know.

Sooloos, Roon, G series (with LPS upgrade), 800 series (with LPS upgrade), HD621, AC200, Prime and PS, DSPs old and new.

Purdeys, Moke, Leica, 'Blad. Only the best.