diff --git a/plugins/00_dokku-standard/backup-check b/plugins/00_dokku-standard/backup-check
new file mode 100755
index 000000000..91e7bfb51
--- /dev/null
+++ b/plugins/00_dokku-standard/backup-check
@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
+VERSION="$1"
+IMPORT_DIR="$2"
+TARGET_DIR="$3"
+APPS="$(< $4 )"
+
+ret=0
+
+for app in $APPS; do
+  if [[ -d $TARGET_DIR/$app ]]; then
+    ret=1
+    echo "Trying to import application $app which already exists." 2>&1
+  fi
+done
+
+exit $ret
+
diff --git a/plugins/00_dokku-standard/backup-import b/plugins/00_dokku-standard/backup-import
index 076c0e930..86404a99b 100755
--- a/plugins/00_dokku-standard/backup-import
+++ b/plugins/00_dokku-standard/backup-import
@@ -6,8 +6,8 @@ TARGET_DIR="$3"
 
 [[ -f $IMPORT_DIR/.sshcommand ]] && mv $IMPORT_DIR/.sshcommand $TARGET_DIR/.sshcommand
 if [[ -f $IMPORT_DIR/.ssh/authorized_keys ]]; then
-    mkdir $TARGET_DIR/.ssh
-    mv $IMPORT_DIR/.ssh/authorized_keys $TARGET_DIR/.ssh/authorized_keys
+    mkdir -p $TARGET_DIR/.ssh
+    cat $IMPORT_DIR/.ssh/authorized_keys $TARGET_DIR/.ssh/authorized_keys | uniq > $TARGET_DIR/.ssh/authorized_keys
     chmod 0700 $TARGET_DIR/.ssh
     chmod 0600 $TARGET_DIR/.ssh/*
 fi
diff --git a/plugins/backup/commands b/plugins/backup/commands
index a4e406e79..9aa6cdc65 100755
--- a/plugins/backup/commands
+++ b/plugins/backup/commands
@@ -33,6 +33,13 @@ set -e; case "$1" in
     ;;
 
   backup:import)
+    if [[ $2 == "-f" ]]; then
+      force=true
+      shift
+    else
+      force=false
+    fi
+
     INPUT_FILE="$2"
     [[ -z $INPUT_FILE ]] && INPUT_FILE="-"
 
@@ -56,6 +63,15 @@ set -e; case "$1" in
     BACKUP_ROOT="$BACKUP_TMP_DIR""$DOKKU_ROOT"
     TARGET_DIR="$DOKKU_ROOT"
 
+    if ! pluginhook backup-check $VERSION "$BACKUP_ROOT" "$TARGET_DIR" "$BACKUP_TMP_DIR/.dokku_backup_apps"; then
+      if $force; then
+        echo "-f used. Ignoring warnings."
+      else
+        echo "Archive did not pass sanity checks. Use -f to import anyway" >&2
+        exit 1
+      fi
+    fi
+
     # create all the app directories
     while read app; do mkdir "$TARGET_DIR/$app"; echo "Imported $app"; done < $BACKUP_TMP_DIR/.dokku_backup_apps