diff --git a/doc/sojus.md b/doc/sojus.md
index 936f824..ec0db4c 100644
--- a/doc/sojus.md
+++ b/doc/sojus.md
@@ -1,4 +1,28 @@
 # sojus
+
+## test if backups work
+```shell
+cd /home/backup/repos/
+borg list <repo>/system
+borg check -v <repo>/system
+```
+
+## test if backups work from remote
+```shell
+/etc/cron.d/borgbackup_system_create_sojus
+cat /var/log/borg/system_create_sojus.lastlog
+```
+
+## retrieve files from backup
+```shell
+cd /home/backup/repos/
+borg mount <repo>/system /mnt/
+```
+retrieve backup data from /mnt
+```shell
+borg umount /mnt
+```
+
 ## create big backup locally
 ```shell
 cryptsetup luksOpen /dev/disk/by-id/ata-<ID>-part1 ata-<ID>-part1
diff --git a/group_vars/fet_lxc_void b/group_vars/fet_lxc_void
index 982e651..f52e56a 100644
--- a/group_vars/fet_lxc_void
+++ b/group_vars/fet_lxc_void
@@ -8,6 +8,7 @@ common_basic_packages:
   - git
   - htop
   - logrotate
+  - ldns
   - ncdu
   - rsync
   - strace