I’ll add a shoutout to the CloudSync app on Synology, which let’s you connect to most of the major cloud storage providers and sync up, down or bidirectionally. I use it back up (sync changes down only) my Dropbox, Google Drive, GCS and B2 folders. It’s especially handy for quick access to the > 1tb assets I have in Dropbox that I don’t have space to sync to my space limited computer HDs. Plus with Recycle Bin enabled on Synology shared folders you get ad hoc restoration of deleted files dating back as long as you want.