All's not what it seems

Time machine doppelgänger

I backup our Macs to Time Machine running on a Synology DiskStation NAS. The TM folder is named, imaginatively enough, time machine. Some time ago, the backups stopped, but I've only just got around to sorting it out—almost three months later. (embarrassed)

When re-establishing the connection to the folder, I was presented with the following options:

Do you want to stop backing up to “time machine” and use “time machine” instead, or back up to both?

If you use both, Time Machine will take turns backing up to “time machine” and “time machine”.

Yeah, well that's not too helpful really. It seems that my options are to rewrite the original—which takes more time and loses backup history—or create a duplicate—which wastes space. All I want to do is carry on with the original where I left off.

dialogue options: Do you want to stop backing up to “time machine” and use “time machine” instead, or back up to both?