I also use Synology, but with apple photos. There's a mac mini on my home network that syncs the photo library automatically, and then Synology Drive syncs the local folder to the Synology. That is in turn backed up to backblaze weekly
How do you sync your Apple photo library to your Syno, given the Apple library is a package file containing a maze of machine-generated nested folders and many nearly duplicate image files (at least for those images you’ve edited)?