Microsoft OneDrive made a complete hash of my backing up. Windows 7 was giving loads of trouble and the only way to go about it was to back up all files and reinstall the OS. So I backed them all up on OneDrive, knowing it to have been reliable in the past.
Guess what, bar one file (specifically, the music used in the NG film Mario Plays Flappy Bird), all my files -- including FL Studio projects, soundfonts, samples, all that I had worked so hard on making over the last three years -- all are now gone and unrecoverable.
Yes, that also means all the Kingdom of Herts stuff, the works in progress of classic songs including Propter Te, Terre des Hommes Libres etc.
Turns out that no matter how long was spent doing it, OneDrive just completely failed to sync them all.
I am now not touching OneDrive with the end of a blooming beanpole.