The containers are mostly for developing on. They have this feature that I didn’t get to use before I trashed my original container. Maybe then I would still have some of my old files. But the feature basically tracks and stores old history of the file. So if you happen to replace it by accident, you can restore the file back to normal. It usually makes a backup each time you make a change or save to the file.
But this is for people who don’t really want to spend a dime on something. You still get the same features as you do with a paid Digital Ocean VM. And most of these containers are Linux based so you can use sudo apt-get and sudo yum if you want. The other day, I was messing around with one of my containers and I actually got a hold of my .bashrc file and I replaced it with one of mine so I was able to create some new alias commands. Sometimes, free hosters won’t even let you do that so it’s a nice thing they let you take full control over your containers.