Am I correct in understanding the following:

With an Electrum Personal Server (EPS), one can have the timechain on an external SSD, and actually one doesn’t HAVE to have it running continuously, so that, if on the road, one can take the SSD and laptop and periodically connect them to synch to the latest block.

And then can use Sparrow and, if needed, can send/receive transactions..

Have used Umbrel with a raspi before, just curious about this new setup.. playing with it today