Managing backups

I  have a Creative Cloud Photography plan and want to retain my images on both a Thunderbolt external hard drive and an external SSD. I travel away from home for a couple months each year and want to bring an exact copy of the Thunderbolt drive on the SSD for use while I'm away from home. It's much lighter to carry and I'm carrying too much stuff already. I use 'Super Duper' as backup software and a MacBook Pro for computer..

What I imagine doing is traveling with the SSD and adding to it as I photograph and also continue to work with my existing images. Then when I return home I can copy the SSD onto the Thunderbolt drive. I will then, on that day, have two drives with the identical contents. I can imagine some further refinement of my overall back up strategy.

I converted to the new plan for Adobe in April 2018 and find my back up dated October 2017 appears to have a different file structure with the 2018 drive displaying the data under date headings with the 2017 drive displaying the data alphabetically. There are too many images to manually proof but a cursory examination finds the images are on both drives.

I'm looking for counsel on whether this plan will work and suggestions for implementation.  I assume that both drives will eventually be SSDs but don't want the expense at this time.

Thank you.