Using Version 2.03.10 as reference (which works fine after some installation hassle), I would like to suggest following feature: Be able to retrieve previous versions of a file.
This is possible in the Windows version, but not in the Synology app:
https://www.idrive.com/online-backup-classic-faq#sync10:
"The Sync folder maintains up to 10 previous versions of all the files.
Steps to restore previous versions of a file ....."