You could try using restic copy. Do the backup the normal way for the local repo, and then send the resulting snapshot to the remote repo. But be aware that you have to set up the repos to have the same chunker parameters or the deduplication will be poor.
Long-time Linux / BSD user
DevOps / Sysadmin
Anarchist (billionaires are bad)
Asexual (will not lewd)
40s, he/him, USA
Will scare you with infosec talk
Hopes to be a nice and kind person