USB drive? Home network?

If you want to record a part of the song then transfer files and record more tracks afterward, it's easy to do with a usb storage or establishing a network.

But I sens you think about recording on both computer at the same time with only one audio interface : this can't be done. It just can't
If you had a second audio interface, you could sync them using midi and record at the same time on both then transfer the files for mixing..
But this isn't necessary. Recording isn't asking much of the computer but the drive to write data. Any computer can record many tracs at once.
Where it gets hard is when you had realtime effects. When the audio gets to the computer, effects are applied and played back to you, the CPU and ram will work harder and latency can be a problem.

I won't get further before knowing more about what you want to do. Please explain in detail and the reasons.

iCloud works for me, once you factor in the transfer times - but it does let me work on projects on a variety of machines. I only recently discovered that each computer has duplicate files on it's drive. I assumed that the files were only on the cloud, and It was a surprise to see them on my machines!