Proxmox LXC migration from ext4‐node to zfs‐node

Problem

When trying to migrate LXC from command line using ...

pct migrate [ID] [name of zfs-node] --target-storage [name of storage]

... you get error ERROR: migration aborted (duration 00:00:00): storage migration for 'local-lvm...' to storage '[name of storage]' failed - cannot migrate from storage type 'lvmthin' to 'zfspool'

One solution

Migrate LXCs using Proxmox Backup Server (PBS)

Steps

Configure both nodes to use same backup Datastore.

1. Create user

Set zfs-node as "DatastoreAdmin" in PBS so that it sees backups of ext4-node.