Indeed it is, it’s an NVMe in an enclosure. Sadly I had to attach it to an slower USB2.0 port as umbrelOS was failing to start (boot loop) when connecting it to the faster USB3.0 port.
But also here it does not sound that logical to me that the first 600GB could be stored quickly and for the comparable small rest it takes way longer 🤔
Network (bandwidth) with my ISP usually also is stable. But okay, maybe I‘ll just be a bit more patience 🙏.
Thanks for your hints, tho!