It’s less of an issue with 5, than 1. With 1 you still have the issue of a disk failing and having to rebuild. But you just have to have more raw and less avail

It’s less of an issue with 5, than 1. With 1 you still have the issue of a disk failing and having to rebuild. But you just have to have more raw and less available. If you have 4 8TB disks set up as a volume in RAID1 or 5, you have the same risk of disk failure affecting the entire volume. But you have 16TB available in RAID1 and 24 in RAID5. You could create two volumes with RAID1 but then data management is more of a hassle, and you could just bump it to 6 drives and have two RAID5 volumes.