Backup and restore LUN0 and OS disk in Azure

==================================Backup process

1. Configure backup for rac2 which includes only LUN0 (+ OS disk, by default)

Backup configuration script from CLI: 

az backup protection enable-for-vm --resource-group marirac --vault-name vault485 --vm rac2 --policy-name  mkpolicy --disk-list-setting include --diskslist 0

Check settings from Portal: 

2. Create test files on / and /u01

[root@rac2 ~]# touch /u01/mari_u01
[root@rac2 ~]# ll /u01/mari_u01
-rw-r–r– 1 root root 0 Jun  2 15:24 /u01/mari_u01

[root@rac2 ~]# touch /mari_root
[root@rac2 ~]# ll /mari_root
-rw-r–r– 1 root root 0 Jun  2 15:24 /mari_root

==================================Restore process

1. Find the latest restore point from Azure CLI:

az backup recoverypoint list --vault-name vault485 --resource-group marirac -c rac2 -i rac2 --backup-management-type AzureIaasVM

2. Restore OS and LUN0 disks:

az backup restore restore-disks --resource-group marirac --vault-name vault485 -c rac2 -i rac2  --target-resource-group marirac --storage-account mzx41qmarivol2asrcache --diskslist 0 --rp-name 5638874691908752817

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The above script restores them as managed disks, that are not attached to anything. Note restore did not replace the disk, it just restores as a new disk. 

3. To replace disks do the following:

Detach old LUN0 -> Save -> Attach restored disk as Lun 0. 

To replace existing OS disk with restored one, click Switch OS disk and then start the VM. 

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4. Check that files are not there anymore:

[root@rac2 ~]#  ll /mari_root
ls: cannot access /mari_root: No such file or directory

[root@rac2 ~]# ll /u01/mariu01
ls: cannot access /u01/mariu01: No such file or directory