Usman Asar

of course you can, this is how I embed videos into my moodle, my video files are (depending on my mood) sometimes in a seperate folder with other moodle folders (like video assets) and sometimes I have central video repository outside of my moodle folders, but you need a third party player to run that videos, which in my case I am using Easy Video Player (I have customized it to refer to central setting file).

A startup wouldn't do much, in fact I have started recommending those who start from shared host, not to consider the very basic accounts for moodle, unless they are only using to test moodle or use it as a staging server, I can understand the complexity of setting up a cloud node, where everything starts from ground zero, but then there are Pro/Business shared accounts offered by shared hosting that would at least let you test run your website with some users (now that depends how much resources are allocated) as for some hosting providers Pro/Business means lesser accounts per server while keeping hardware resources as equal as any other shared accounts, whilst to some, on top of lesser accounts, they do allocate some more resources (like more CPU cores and more RAM), I manage to find a shared hosting provider that gives enough to start with (8 CPU cores, 16GB RAM), and you can allocate the resource pool to make isolated accounts, or allocate all to one account, on top you can buy more (upto 1024 cores and 2048GB RAM) as you grow, this gives you freedom of expansion and at the same time works just like any other shared host (support, CPanel etc), if you want I can provide you links.

javier, there is no one way to tell if the server can hold or not, you haven't mentioned where have you hosted the site? Shared, VPS, Dedicated? and what resources you have allocated and with what software running (O/S, WebServer, Database and any cache plug-ins).

in your scenario, where you are unsure about the load, I would have gone with a cloud hosting (Linode, DigitalOcean, AWS) to start with, as there you can lift your resources instantly seeing the load on server is increasing.

Kavya, I am afraid no one will assist you in writing a plug-in specially if you have a non-development background, for, developers only visit community forums to support their own plug-ins, they dont randomly reply to posts asking for assisting in writing plug-ins, other community members can assist in existing plug-ins but surely not in writing something from ground-zero, if you want a customized plug-in then you can ask the PayUBiz for their support, alternatively for the service of a plug-in writer in jobs section HERE.

David, if you haven't configured in scheduled tasks, it wont. That is why I linked setting up using scheduled tasks so it will run automatically, if you dont need cron running that frequently (like you mentioned making changes in quiz hadnt updated), you can manually run it once a day, moodle will still run fine.