meta.json is 47 bytes. A single line
{“source”:“discourse”,“version”:20150422160235}
Edit:
Unless there is something tricky in the backup system, I am 99.9% certain it was the right file
EditEdit:
Not sure if it matters, but the original backup came from var/docker. The new install is located in var/discourse
The original backup loads though, until the error in line 3.9Million