add option to exit

backup

@@ -46,14 +46,17 @@ for x in $UUIDS; do
     i=$(($i+1))
 done
 total_mounted=$i
-echo "The following mounted BTRFS devices were found."
+echo "Selected a mounted BTRFS device to backup to:"
-disk=0
+while [[ $disk < 0 || $disk > $i ]]; do
-while [[ $disk < 1 || $disk > $i ]]; do
     for x in ${!TARGETS_ARRAY[@]}; do
         echo -e "$(($x+1))) ${UUIDS_ARRAY[$x]}\t(${TARGETS_ARRAY[$x]})"
     done
+    echo "0) Exit"
     read -p "Select one: " disk
 done
+if [[ $disk == 0 ]]; then
+    exit 0
+fi
 selected_uuid="${UUIDS_ARRAY[$(($disk-1))]}"
 echo "You selected the disk with UUID $selected_uuid."
 
@@ -64,8 +67,6 @@ else
     exit 1
 fi
 
-echo "Performing backup..."
-
 for x in $SNAPPER_CONFIGS; do
 
     # shellcheck source=/dev/null
@@ -87,6 +88,7 @@ for x in $SNAPPER_CONFIGS; do
 
         BACKUPDIR="$(findmnt -n -v -t btrfs -o UUID,TARGET --list | awk '/'$selected_uuid'/ {print $2}')/$mybackupdir"
         backup_location=$BACKUPDIR/$x/$new_number/
+        echo "This will be the initial backup for snapper configuration '$x' to this disk. This could take awhile."
         echo "Backup location: $backup_location"
         read -n 1 -p "Continue (y/n)? " cont_backup
         echo
@@ -94,7 +96,6 @@ for x in $SNAPPER_CONFIGS; do
             continue
         fi
         mkdir -p "$backup_location"
-        echo "Performing initial backup for snapper configuration '$x'. This could take awhile..."
         btrfs send "$new_snapshot" | btrfs receive "$backup_location"
 
     else