I now have the Synology back up and running, at least up to a point. It appears I was able to fully back up my data, replace the disks and rebuild the volume. I’m now in the process of trying to restore the data and reconnect it to OneDrive, Dropbox and other online services.
One nice side effect of this is I’m able to perform the basic reorganization I should have done a while back. At least now I can move the folders and make really, truly take one copy of everything with me instead of multiples.
That being said, I do have one more rebuild to go. I had four disks in there and one was new. I thought I’d left that as disk #1, but apparently I was wrong. I think it was actually disk #4 which ended up failing and causing the whole meltdown to begin with. So, I now need to perform the replacement one last time. I’m just waiting for the full disk scan and parity check to complete, then I shutdown, replace the drive and rebuild.