> A backup that isn't tested is not a true backup, it is a disappointment waiting to be found

Yup. 500 gigs of disk seatfiller (a full backup in this instance would have been somewhere between 1-2T)

Live and learn.. and learn again later when you let yourself slip :)

My backup process is a LOT noisier if any of the commands fail/timeout/dirs-arent-same-size-after now!