I have the DVR server running on Synology 920 and two NVIDIA Shields as clients. The 920 is not on a UPS yet.
I recently lost power for a few hours, but my internet was down for a few days.
When my power came back on (but the internet was still down) the guide data was missing for those few days until my internet was restored.
When my power is restored, could/should the server use the last available guide data (from before the power outage) while the internet is still down?