az cli install

curl -sL https://aka.ms/InstallAzureCLIDeb | sudo bash
az login

Copy snapshot from one region to another:

SUBSCRIPTION_ID=a7ab1d40-7176-42a9-9156-0eb7fbe1ae3e

az disk create \
    --resource-group CHALLENGES \
    --name qtim-challenges-os-disk-backup-disk-new \
    --source qtim-challenges-os-disk-backup-eastus \
    --zone 1 \
    --location eastus

az disk create \
    --resource-group CHALLENGES \
    --name qtim-challenges-disk-eastus \
    --source /subscriptions/$SUBSCRIPTION_ID/resourceGroups/CHALLENGES/providers/Microsoft.Compute/disks/qtim-challenges_OsDisk_1_2739395aad8147d1954d583529de7dab \
    --location eastus

az snapshot show \
    --resource-group CHALLENGES \
    --name qtim-challenges-os-disk-backup-eastus

az snapshot create \
    --resource-group CHALLENGES \
    --source /subscriptions/$SUBSCRIPTION_ID/resourceGroups/CHALLENGES/providers/Microsoft.Compute/disks/qtim-challenges_OsDisk_1_2739395aad8147d1954d583529de7dab \
    --name qtim-challenges-os-disk-backup-eastus \
    --location eastus

az vm disk attach \
    --resource-group CHALLENGES \
    --vm-name qtim-challenges-new \
    --name qtim-challenges-os-disk-backup-disk

az snapshot create \
    --resource-group CHALLENGES \
    --source qtim-challenges-os-disk-backup-disk \
    --name qtim-challenges-os-disk-backup-disk-snapshot