Support

You cannot keep the backup archive. It's part of the cleanup.

Kickstart performs the cleanup by asking your server to delete kickstart.php itself, the backup archive and the installation folder (including its contents). If the permissions AND ownership of these files and folders allows them to be written to then they will be deleted. I have confirmed that this is the case just now as have so many other people in tens of millions restorations over the past 13 years Kickstart has existed.

The only reasonable conclusion is that the files either don't have the correct ownership and permissions to be deleted or we are talking about different files. Which files are you talking about? Exact names, please.

Do not use Kickstart Professional UNLESS you need its additional features, namely importing a backup from a URL or Amazon S3. Use Kickstart Core instead.

The cacert.pem file will not be removed automatically. You also do not need it on most servers. You only need to upload it if you are importing from S3 or an HTTPS URL with Kickstart Professional on a server which does not have a correct root certificates cache set up for PHP.

The INI file is a language file. It's only provided should you want to translate Kickstart yourself. The English language strings are already included in Kickstart itself. If you upload a translation file it needs to have the same base name as Kickstart itself. So, if you call your file restore.php the language file should be named en-GB.restore.ini for English, nl-NL.restore.ini for Dutch etc. Only then will it be removed automatically.