Version 7.x-3.10, PHP 8.0.23 and also PHP 8.1.10, Drupal 7.94.
Connections to FTP servers do not work with the error message:
TypeError: ftp_systype(): Argument #1 ($ftp) must be of type FTP\Connection, null given in ftp_systype() (Zeile 200 von /data/web/1/000/093/862/375634/htdocs/sites/all/modules/backup_migrate/includes/destinations.ftp.inc).
Open Backup setting, Destinations, click "list files" (BTW: not translated to German) of an FTP destination.
Based just on the error message/not checked on the source code: Use an argument type either accepting null, like ?FTP\Connection, or else no argument type at all.
Closed: duplicate
3.10
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
I am marking this as a duplicate of FTP error with php 8.0 🐛 FTP error with PHP 8.0 Fixed , even though this issue is older and has perhaps a better title. Reason: the other issue has more comments.
I will edit the other issue to include your steps to reproduce.