Don't exit VM backup scripts immediately on failures

site-cookbooks/kosmos_kvm/templates/backup_all_vms.sh.erb

@@ -1,14 +1,12 @@
 #!/bin/bash
 # GENERATED BY CHEF
 # DO NOT EDIT
-set -e
 
 echo "Backing up all VMs with kvm_guest chef role..."
 
 for domain in <%= @vm_domains.join(" ") %>
 do
-  /root/backups/backup_vm.sh $domain
-  /root/backups/prune_vm_backups.sh $domain
+  /root/backups/backup_vm.sh $domain && /root/backups/prune_vm_backups.sh $domain
   # TODO Enable this when upgrading borg to 1.2
   # borg compact $BORG_REPO
 done