Just when browsing my files I spotted a thing. I have backup worth of over a year data (about 9 GiB) and its destination location contains 915 files and 12 362 folders. That’s more 10x empty folders than data files. I assume this is by design. But these empty folders are (re)used for something later?
It is due to sharding:
and developer decision to create all folders up front instead of only when needed. At the end either way is fine.