The Quadra 900 was based upon the Motorola 68040 processor. It was not a machine for the masses as it cost US$7,200 in 1991. It was the first model to be able to run Mac OS 8 when it was finally released.
We have come a long way in computing since then. Now you can download an App implementing a Quadra/Mac OS 8 emulator Macintosh.js. The emulator can be downloaded from Github.
According to info on Github “Yes, you can [transfer files to and from the virtual machine]. Click on the “Help” button at the bottom of the running app to see instructions. You can transfer files directly – or mount disk images.” You CANNOT connect for the internet.
See my other Mac & macOS related posts
If you are looking for other interesting macOS software, visit my macOS Software Directory page. Currently, there are over 640 titles indexed with more than 220 available for FREE https://johnpurvis.wordpress.com/macos-software/