That's really the unfortunate things that could happen to a crypto investor like you. It also happened to me before when my MEW's backup coundn't be located anymore in my disk. Good thing is that i already the cryptos that i have there are the cryptos i got from airdrops that remains sitting there for couple of months already but still not listed in the market.

MEW is only offering options for a backup before the creation of the wallet but recovering it is not supported yet in MEW, IMO.