Need help figuring out the configuration

Hey all! I currently use two external USB drives to backup photos from our camera/phones. I basically copy new photos/videos to both hard drives manually creating a mirror copy. I am looking into other options but I'm not sure which would be a better approach. My options are:

1. Continue doing what I do now (i.e. manually copy to each drive)
2. Create a RAID using MacOS' built-in RAID setup so I only see both hard drives as one
3. Get a multi-bay enclosure and either continue doing #1 or setup a RAID via MacOS. This would eliminate some clutter from the desk.

One question I have about the RAID setup is, if I were to take one of the hard drives and attach it to a different computer, would I still be able to access the files?

I'd appreciate your help. Thank you.