when you were naughty and didn't encrypt a server and now you don't need it anymore 
Discussion
nice to see more people using Hetzner
if this was an NVMe, you could do secure erase with the nvme command, which maps everything to empty on the firmware + deletes the encryption key of the existing data
(most NVMes are self encrypting already)
sadly its a very old pre-nvme-in-servers box that has been used for everything under the sun and needs to be burned now
newer ones I just do busybox+luks
you should’ve gotten the 60€ 5950X servers from server auction while they were cheap
2x 3.84 TB DC NVMe, 128GB ECC DDR4 too