How are you getting that? It looks like the sort of preview a hover over icon can do, however mine doesn’t. Note that I have an ad for Gemini, but haven’t enabled that:
As it’s encrypted on your computer before even being sent out, it’s not readable as anything meaningful. If something writes it or deletes it, that backup gets damaged.
Backup files are typically visible at the destination I think. Leave them alone unless trying to do something like manually delete a files for a backup that you don’t want.
discusses another option which is probably worse in terms of storage management.