I work on and this and that and may never return to the same setup again. There are so many combos or setups out there nothing is as typical especially when narrowing down an issue. All, I can say, if I did offer to do this or that and return because of what hasn't done as I explained, "there's your sign".
As for back-up it's a lesson only needed to learned once(cross-fingers). AND yeah, I can't save it now, it's too late for my actions other than minor.
Now with so much data on large(huge) drives, I suggest they buy two(2) it's worth it in the long run. -----Willy