Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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There's many ways to do this. Saving the disk state is one, I believe that's what the other person suggested - essentially stores the disk as an image which then you use for future vms as your jumping off point. This is also essentially how workstations are deployed at companies. (Essentially being the key word). Cloud providers have different names for this too, in AWS this is called their AMI.
Another option is Ansible, which essentially handles deploying a VM by running your scripts for you. I haven't played too much with this, and I doubt it works with VirtualBox, but it's something you may want to look into, it would definitely uplevel your skills.
Thirdly is dependent on what you actually use your VM for, you haven't given your use cases but this is one of the reasons containerization became such a thing - because when running an app we mostly don't care about the underlying system. It may be worth it to learn about docker.
I’m playing with a multicast data delivery software I’m building. Doing tests from a sever (VM) to 20+ clients and/or other server (VMs). All running through a Open5GS gNodeB (5G network core). Also testing out potential software to be a docker image. I’m slowly converting to containers but I might just need to make the leap.
Sounds like it, I think docker is exactly what you're looking for