This could sound like a strange question, so let me explain why I need a 24h assistance service for a Joomla site. I've created a website for a customer, using many extensions (EasySocial, Community Surveys, Quick2cart, etc.). I've done this in my spare time and I'm not always reachable by my customer due to circumstances related to my work.
The customer is aware of this and it's fine for him to wait weeks for a change in the site, for a new feature request and for planned maintenance. But, if there's suddendly something unexpected with the website (which is commercial), to whom could he call? So, I'm asking if there's someone who gives as a service (at payment, of course) a 24h remote assistance, for a little annual fee or also hourly payed.
Is there something similar to my description in the Joomla world?