I have being trying to follow the instructions for upgrading to backdrop cms from existing drupal 7 site. However, I am getting stuck with this error: "Table variable already exists".
I presume this is a table from the drupal dB that has been imported into the backdropdB and it may be left over from my attempts at converting from drupal 7 to 8 which I have now given up on.
I have disabled the three contributed modules I was using in drupal 7: email; IMCE and SecKit. There appears to be another module Drupal 8 upgrade evaluation which I have also disabled.
What tables need to be imported into backdrop to do the upgrade?