How to do offline backup?

Suppose there are two computers, A is offline, B is online. I want to backup A with duplicacy and copy the backup generated by duplicacy to multiple cloud storages.

What I’m going to do:

  1. In A: Duplicacy backup to local with password
  2. Transfer backup generated by duplicacy from A to B

How to use duplicacy in B to backup to multiple cloud storages without exposing password in B? I don’t want to enter password in B because it’s online.

It appears it’s not possible with duplicacy: RSA encrypted storage, copy-compatible, copy requires private key - #2 by gchen

You can however replicate duplicacy datastore using other file synchronization tools.