As a project to get to know Backdrop, I want to convert the existing Wordpress site of the local environmental organisation that I'm involved with into a Backdrop site.
As a sidenote: I used Lando to spin up a Backdrop site as well as a Wordpress site on my local desktop computer. I learned about Lando during the recent Backdrop Live event and it seems very useful piece of software! I plan to write some documentation on using Lando for developing new Backdrop sites and I will probably start a separate Forum topic to get some feedback on that.
The Wordpress site is relatively simple: it contains 118 posts, 20 pages and 460 media files. It was pretty straightforward to export the full content of the site and I saved the resulting WXR file on my local hard drive. On the blank Backdrop site I installed the Wordpress Import module and I tried to import the WXR file by using Content -> Wordpress Import. The file is uploaded to the Backdrop site (into the directory /files/wordpress), but it generates the following error:
This file does not appear to be a valid WXR file. The file is either corrupted or invalid XML. In some versions of WordPress, the export function can produce malformed XML. Please see README.txt (included in the module archive) for further guidance.
I then tried to import the WXR file on the blank Wordpress site that I created via Lando and there the WXR file was imported flawlessly. So there's obviously something wrong with the module. I've reported the issue on Github.