I’m as other looking for an alternative to Crashplan and before diving to Duplicati hope someone can verify that is can be used the way I used Crashplan.
Basically I have 3 machines that backup to each other.
A Macbook where backup is sent to the other to machines.
A Linux server doing local backup and sending backup to machine 3. Also receiving backups from the other 2.
A Windows laptop sending backup to machine 2 and receiving backup from the other two machines when an external USB is connected.