Offical information to the supported software on our servers.
PHP 7.2 7.3 , all other PHP versions are end of life or close to, see also PHP support https://www.php.net/supported-versions.php
So secure our servers and your service, we only support the latest version of PHP on our servers
Nextcloud: 18 &19 ( updated 19.06.2020)
If you run a older cloud version that does not support newer PHP, Apache,... versions and your cloud is not working anymore, we can only reinstall your service with a new cloud.
If you have our update addon, your cloud will be always at the latest stable version and compatible.