The V1910 switch requires that all configurations be saved, or they'll be lost after a power cycle. I'm sure all users learn this pretty quickly after spending time configuring a switch, and assuming that it was saved into the switch's nvram. They unplug the switch, move it, and then discover all their work is lost.
You need to go to Device:Configuration and click Save.
The configuration backup system is also in that section. You just download the file to your computer. To restore, you upload the file via another tab in the interface.