add options to set backup destination and target container manager. Also fix typo in to write backups to correct location

lxc-backup.sh

@@ -1,12 +1,19 @@
 #!/usr/bin/env bash
 
 main() {
-  while getopts ":l:" opt; do
+  while getopts ":l:d:t:" opt; do
     case "${opt}" in
       l)
         unset VM_FILTER
         IFS="," read -r -a VM_FILTER <<< "$OPTARG"
         ;;
+      d)
+        local backup_location="${OPTARG:-'.'}"
+        backup_location="${backup_location%/}"
+        ;;
+      t)
+        declare -g TARGET="$OPTARG"
+        ;;
       *)
         usage
         ;;
@@ -31,7 +38,7 @@ list_vms() {
 	lxc list -c n -f csv,noheader
 }
 
-usage() { echo "Usage: ${0##*/} [-l vm1,vm2,...]"; exit 1; }
+usage() { echo "Usage: ${0##*/} [-l <vm[,vm...]>] [-d <backup_dir>] [-t <lxc|incus>]"; exit 1; }
 
 backup_vms() {
   local backup_location="$1"; shift
@@ -52,13 +59,13 @@ start_backup() {
   local vm=$1
   local backup_base="$2"
   local destination="${backup_base}/${vm}"
-  echo "$vm -> $destination"
+  local backup_name="${vm}_$(date +"%Y-%m-%d_%H-%M-%S").tar.gz"
 
-  # Check destination base exists
-  # Check VM folder exists
-  # Check if archive already exists
-  echo "lxc export "$vm" "$destinationi/${vm}_$(date +"%Y-%m-%d_%H-%M-%S").tar.gz""
-  lxc export "$vm" "$destinationi/${vm}_$(date +"%Y-%m-%d_%H-%M-%S").tar.gz"
+  [[ -d "$backup_base" ]] || { echo "${backup_base} is not a directory"; exit 1; }
+  [[ -d "$destination" ]] || mkdir "$destination"
+  [[ -f "$destination/${backup_name}" ]] && { echo "Backup already exists"; return 2; }
+
+  lxc export "$vm" "$destination/${backup_name}"
 }
 
 main "$@"