Congrats for all the hard work and the successful resolution. As someone who knows enough about servers and Linux to get into a lot of trouble, I've been there and done that. It's always a miracle to find that un-corrupted database backup as a surprise.
I've had "bullet proof" tape systems with miles of corrupted data on them ..
A question, tho .. why are you archiving the entire DB nightly, instead of exponentially smaller incremental backups?
Thanks for your efforts, and I'm glad to be able to read here again.