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-rw-r--r--blog/butter.md13
1 files changed, 11 insertions, 2 deletions
diff --git a/blog/butter.md b/blog/butter.md
index b35e6d6..e15b0c4 100644
--- a/blog/butter.md
+++ b/blog/butter.md
@@ -182,6 +182,7 @@ today=$(date --iso-8601)
 btrfs subvolume snapshot -r /home /home/$today
 sync
 btrfs send /home/$today | btrfs receive /backup/home
+sync
 ```
 
 ### Repetition
@@ -190,6 +191,7 @@ For next backups, I also mounted the drive and created a snapshot:
 
 ```sh
 cryptsetup luksOpen /dev/sdb backup
+mkdir -p /backup
 mount -o noatime,compress-force=zstd:14 /dev/mapper/backup /backup
 today=$(date --iso-8601)
 btrfs subvolume snapshot -r /home /home/$today
@@ -197,12 +199,19 @@ sync
 ```
 
 Say the latest snapshot was on the `$previous` day, I only needed to send
-the difference between the old and new backup.  Afterwards, it is safe
-to delete the local `$previous` snapshot to save some space.
+the difference between the old and new backup.  Afterwards, it is safe to delete the local `$previous` snapshot to save some space.
 
 ```sh
 btrfs send -p /home/$previous /home/$today | btrfs receive /backup/home
 btrfs subvolume delete /home/$previous
+sync
+```
+
+Finally, unmount the drive and close the LUKS volume:
+
+```sh
+umount /backup
+cryptsetup luksClose backup
 ```
 
 Is this more complicated than good ole `rsync`?  Yes.  Is it safer?  Also yes,