

My predecessor at work had a “backup scheme” where each week a full copy of important VMs’ virtual disks would be pulled by a backup VM. Two issues with that. One, the VMs were not powered off and nothing ensured that the disks were synced. Two, the backups were made onto the same physical host with no replication or high availability beyond RAID 1.
This is something the people of !Selfhosted@lemmy.world are better suited to answer.
In my personal opinion, for most home servers, the double redundancy of RAID 6 is more valuable than having a fully rebuilt array as soon as possible. If one member of a RAID 6 array fails, you’re still at an effective redundancy of a RAID 5. If one member of a RAID 5 array fails, you have zero redundancy until the hot spare is rebuilt.
If energy consumption is also a factor, it’s worth keeping in mind that a hot spare can be powered down by the controller until it is needed.
I’d personally go with RAID 6: 4 data + 2 distributed parity. That was the plan for my server too, but the motherboard only has four SATA ports and one had to be dedicated to the OS SSD.