I have an old MacBook on which I might like to try installing StartOS.

I would save the contents of the computer to an external hard drive first, but here’s what I’m wondering:

When installing a new OS on an existing machine, does it replace the old OS and all the contents? Or does it create a “split” of sorts, such that when you boot up the computer you can choose which OS to run, and access all the content on the specified system?

Just trying to figure out if I’ll be able to “use” the old MacBook as it was, after I install StartOS, or if it’s a complete overhaul and “no going back”, in which case I’d be much more careful about backing up the old hard drive.

#asknostr