Once upon a time, we used to dogsit for neighbors on our floor.
I had my music and photos all collected up and on a new Terabyte hard drive when I got back from the Philippines. It took months to organize/copy all the cds, drives, etc. It's pretty much all I had kept.
One day Gertie saw a horse on TV.
She leaped from the futon, missing the TV by a good 2 feet, but sliding into my terabyte harddrive with all my cd, drives and archives in it.
I did not have a backup of the backup. A terabyte was not cheap and this had a music server built in, everything.
I may try and dig it back up and see if I can recover the data this time. I still have the CDs, but a lot of them were degraded even back then.