Running a trial of Altaro at present in a lab, so far so good.
Aiming for weekly full and daily incremental to rotated USB disks, like above post Replication to 2nd Hyper-V host as well.... glorified PC in this instance.
Would have preferred Veeam but the client budget (they're a school) doesn't stretch that far and Altaro have offered 15% discount, and the school pays R2.3k for Windows Server licence with Hyper-V role only, allowing two Windows Server guests.