Is it possible to get back one earlier "copy" to paste it back?
Not by default, no. The pasteboard is a temporary storage area, with no safety net. (One of the reasons that MacOS didn't have Cut and Paste of files in the Finder for many years, it is often said.)
There are plenty of apps in the Mac App Store, and elsewhere, that enhance the Pasteboard's capabilities by storing the pasteboard's 'history'.
I use Yoink, which does many Drag-Copy-Paste things, including this. Other more simple apps include things like CommandClip, which just keeps the last 10 text entries. Note that this may include passwords, so care should be taken.