ZBT‑1 continuous Thread support (QNAP NAS)

Hello,
HomeAssistant is running on a QNAP NAS as a virtual machine, which works fine so far. However, whenever I create a snapshot, the ZBT‑1 loses its connection and the information that Thread is set as the default. I always have to manually switch it back to Thread again. Is this a known issue, and how can this be avoided? At the moment, I’m no longer using daily snapshots, but I’m not satisfied with this situation.
Cheers,
Tomi