Yeah, sorry it was a long time ago (like 10+ years) but I checked and it would've been the --overwrite arg.
The manpage for the older ntfsclone command has it:
Clone NTFS on /dev/hda1 to /dev/hdc1: ntfsclone --overwrite /dev/hdc1 /dev/hda1
Moral of the story was to RTFM π
You could use HAProxy on the client side to load balance apps in multiple locations, but it really depends on the application.
I like to manage my software with Ansible but Docker stack files might make it simple enough for you.