Is not quite the same as “is it reasonable”. The first might be a “yes”, but the second is probably a “no”. To elaborate on what @kees-z said, Duplicati uploads changes from the previous backup. The initial upload uploads everything. If I change 1% of data, the next backup uploads perhaps 1%. You could perhaps make Duplicati upload everything each time, but would you want to? I’ve heard of this only for specialized needs.
How the backup process works gets into the technical details, which preclude storing as direct copies like
Create incremental backups without .zip or any compression requests. Maybe ideas there fit your request.