Add backup type selection and performance optimizations

Enhanced backup trigger script with:

Backup Type Selection:
- Auto (use plan's default)
- Full backup (--backuptype=full)
- Incremental (--backuptype=incremental) - faster, changes only
- Differential (--backuptype=differential) - changes since last full

Performance Optimizations:
- Lower compression (--compression=normal) - faster, larger size
- High priority (--priority=high) - use more resources
- Both combined

Users can now choose backup type and optimization level per backup,
allowing CLI operations to be faster than web console when needed.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

modules/backup/acronis-trigger-backup.sh

@@ -89,14 +89,80 @@ case "$choice" in
             exit 1
         fi
 
+        echo ""
+        echo -e "${BOLD}Backup Type Selection${NC}"
+        echo ""
+        echo "Select backup type:"
+        echo "  1) Auto (use plan's configured type)"
+        echo "  2) Full backup"
+        echo "  3) Incremental backup"
+        echo "  4) Differential backup"
+        echo ""
+        echo -n "Select type [1]: "
+        read -r backup_type_choice
+        backup_type_choice="${backup_type_choice:-1}"
+
+        BACKUP_FLAGS=""
+        case "$backup_type_choice" in
+            2)
+                BACKUP_FLAGS="--backuptype=full"
+                echo "  → Full backup selected"
+                ;;
+            3)
+                BACKUP_FLAGS="--backuptype=incremental"
+                echo "  → Incremental backup selected (faster, stores only changes)"
+                ;;
+            4)
+                BACKUP_FLAGS="--backuptype=differential"
+                echo "  → Differential backup selected (changes since last full)"
+                ;;
+            *)
+                echo "  → Using plan's default backup type"
+                ;;
+        esac
+
+        echo ""
+        echo -e "${BOLD}Performance Options${NC}"
+        echo ""
+        echo -n "Enable performance optimizations? (y/n) [n]: "
+        read -r opt_choice
+
+        if [ "$opt_choice" = "y" ] || [ "$opt_choice" = "Y" ]; then
+            echo ""
+            echo "Available optimizations:"
+            echo "  1) Lower compression (faster backup, larger size)"
+            echo "  2) High priority (use more system resources)"
+            echo "  3) Both"
+            echo ""
+            echo -n "Select [3]: "
+            read -r perf_choice
+            perf_choice="${perf_choice:-3}"
+
+            case "$perf_choice" in
+                1)
+                    BACKUP_FLAGS="$BACKUP_FLAGS --compression=normal"
+                    echo "  → Lower compression enabled"
+                    ;;
+                2)
+                    BACKUP_FLAGS="$BACKUP_FLAGS --priority=high"
+                    echo "  → High priority enabled"
+                    ;;
+                3)
+                    BACKUP_FLAGS="$BACKUP_FLAGS --compression=normal --priority=high"
+                    echo "  → Lower compression + high priority enabled"
+                    ;;
+            esac
+        fi
+
         echo ""
         echo -e "${BOLD}Starting Backup...${NC}"
         echo ""
-        echo "Triggering backup for plan: $plan_id"
+        echo "Plan: $plan_id"
+        [ -n "$BACKUP_FLAGS" ] && echo "Options: $BACKUP_FLAGS"
         echo ""
 
         # Try to run backup
-        if /usr/sbin/acrocmd backup run --plan "$plan_id" 2>&1; then
+        if /usr/sbin/acrocmd backup run --plan "$plan_id" $BACKUP_FLAGS 2>&1; then
             echo ""
             print_success "Backup initiated successfully"
             echo ""