Hi, I've just published small program for analyzing cloud storage usage in Yandex Disk account: https://github.com/abcdenis/grandperspective_for_yandexdisk Feel free to use or fork for your favourite cloud storage.
"grandperspective-scan is a small utility created by Rob Haswell that lets you scan folders on platforms other than macOS. It generates a GrandPerspective scan file, which you can then import and visualize in GrandPerspective." from https://grandperspectiv.sourceforge.net/
Ability to limit backup session in size/time
Merge process on separately archived files