As an atheist, I ask for prayers that the backup's good.
E: Your solidarity has worked. The backup is good and not too old. Note for myself and you - install your OS on a snapshotting filesystem so that live backups are possible.
U know, in my panic before remembering I have a backup, I actually considered trying to power it on like that. Maybe the controller could run DRAMless, I thought. Then I came to my senses that running an SSD with potentially shorted traces in a new board is prolly gonna make a bad situation worse.