I found UrBackup to be very easy to use. Very little nitty-gritty setup and configuration required to get started. I have a feeling those with more experience will (rightly) pick apart if I’m missing something egregiously bad about it, but it worked for my small homelab use cases.
All I see is ******
Consider your teacher’s experience with technology here. They may not understand other setups as well as zoom. Plus if there is technical trouble, that may cut into your instruction time. I’m not a huge fan of big-company services like zoom, Skype, teams, or similar, but unless you and your contacts have the time and know-how to troubleshoot issues if they arise, you may want to stick with a known thing like zoom.
I like that you can move back and forth from dockge quite easily, either importing existing compose files or running compose files created by dockge without dockge
The thing about dockge is that it’s easy to go to and from using it. It can scan existing folders for compose files, and because it uses compose files itself, you could just as easily start containers made by dockge without dockge even running.
Of course, this means it lacks some of the fancier features of something like portainer, but I personally enjoy the simplicity
Like others, I’ve had good experiences with eBay- just look for reputable sellers (good reviews, not a brand new seller, etc). Most of what I bought was fine, but the ones that were dead on arrival I was able to get replaced within their warranty window. Just be sure to test what you get as soon as it arrives.