Synology NASs do support expanding capacity with different sized drives using what they call SHR. https://kb.synology.com/en-my/DSM/tutorial/What_is_Synology_H

Synology NASs do support expanding capacity with different sized drives using what they call SHR. https://kb.synology.com/en-my/DSM/tutorial/What_is_Synology_Hybrid_RAID_SHR https://kb.synology.com/en-my/DSM/tutorial/What_is_Synology_... It’s just a fancy UI on top of the standard LVM tools but it does make it easier than doing it manually.