Please Describe how to create a compatible TAR ball

Document to be updated:

https://docs.sophos.com/nsg/sophos-firewall/19.5/Help/en-us/webhelp/onlinehelp/AdministratorHelp/BackupAndFirmware/ImportExport/index.html#exporting-and-importing-a-configuration

Performing a search shows there are a number of tar import failure messages.  Here are a few.

https://community.sophos.com/sophos-xg-firewall/f/discussions/138277/tar-import-fails/514532?focus=true

https://community.sophos.com/sophos-xg-firewall/f/discussions/145268/the-file-that-you-are-trying-to-import-is-not-a-supported-file-format-only-tar-file-format-is-supported

 https://community.sophos.com/sophos-xg-firewall/f/discussions/125593/edited-tar-file-not-compatible-for-import 

 https://community.sophos.com/sophos-xg-firewall/f/discussions/128915/the-file-that-you-are-trying-to-import-is-not-a-supported-file-format-only-tar-file-format-is-supported 

 https://community.sophos.com/product-documentation/i/feedback/sophos-xgs-import-doesn-t-recognize-generated-tarball 

I was able to get it to work but only after a lot of time spent. I had to export from one firewall, open with 7zip, edit carefully with Notepad++, save and drag/drop back into 7zip, replacing the existing Entities.xml.

I then took a look with VSCode. I added the Xml Complete extension and this shows where the errors in the files are.

I had tried the Red Hat extension but it has other dependencies that I didn't want to install.

I introduced a couple of errors into a file and see these:

^^ Hovering over the "2" in the left pane.

^^ Error indication on the tab, in the right navigation pane and the yellow squiggle under the text.

I was then able to correct the syntax and have a good file to import.