Complete rewrite: Single working LVM block-level backup script

- Removed 40+ broken/messy scripts, moved to old_scripts/
- Created lvm_block_backup.sh - proper block-level LVM snapshot backup
- Uses dd for block-level cloning instead of file-level rsync
- Successfully tested: 462GB backup in 33 minutes
- Creates exact, bootable clone of internal drive to external drive
- Proper LVM snapshot management with cleanup
- Clear documentation in README_BACKUP.md
- Clean, minimal solution that actually works

old_scripts/preview_snapshot_migration.sh

@@ -0,0 +1,104 @@
+#!/bin/bash
+
+# Snapshot Migration Preview Script
+# Shows what the snapshot-based migration will do
+
+set -euo pipefail
+
+# Colors
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+BLUE='\033[0;34m'
+RED='\033[0;31m'
+NC='\033[0m'
+
+echo -e "${BLUE}=== Snapshot-Based LVM Migration Preview ===${NC}"
+echo
+
+echo -e "${GREEN}Current System Status:${NC}"
+echo "✅ Booted from: $(findmnt -n -o SOURCE /)"
+echo "✅ Volume Group: migration-vg"
+echo
+
+echo -e "${GREEN}Current Logical Volumes:${NC}"
+sudo lvs migration-vg --units g -o lv_name,lv_size,data_percent 2>/dev/null
+echo
+
+echo -e "${GREEN}Available Space for Snapshots:${NC}"
+free_space=$(sudo vgs --noheadings --units m --nosuffix -o vg_free migration-vg | tr -d ' ' | tr ',' '.')
+if command -v bc >/dev/null 2>&1; then
+    snapshot_size_per_lv=$(echo "$free_space * 0.8 / 4" | bc 2>/dev/null | cut -d. -f1)
+else
+    snapshot_size_per_lv=$((${free_space%.*} * 80 / 100 / 4))
+fi
+echo "Free space: ${free_space}MB"
+echo "Snapshot size per LV: ${snapshot_size_per_lv}MB"
+
+if (( snapshot_size_per_lv < 100 )); then
+    echo -e "${RED}⚠️  WARNING: Limited space for snapshots!${NC}"
+    echo "Consider freeing up space or expanding the volume group"
+else
+    echo -e "${GREEN}✅ Sufficient space for snapshots${NC}"
+fi
+echo
+
+echo -e "${GREEN}Target Drive Analysis:${NC}"
+echo "Internal NVMe (nvme0n1):"
+lsblk /dev/nvme0n1
+echo "Size: $(lsblk -b -n -o SIZE /dev/nvme0n1 | awk '{printf "%.1fGB", $1/1024/1024/1024}')"
+echo
+
+echo -e "${YELLOW}Snapshot Migration Process:${NC}"
+echo "1. 📸 Create temporary snapshots of ALL logical volumes:"
+echo "   • root (${snapshot_size_per_lv}MB snapshot)"
+echo "   • home (${snapshot_size_per_lv}MB snapshot)" 
+echo "   • boot (${snapshot_size_per_lv}MB snapshot)"
+echo "   • swap (${snapshot_size_per_lv}MB snapshot)"
+echo
+echo "2. 🔧 Prepare internal drive:"
+echo "   • Copy partition table from external M.2"
+echo "   • Create LVM physical volume"
+echo "   • Create volume group 'internal-vg'"
+echo "   • Create logical volumes with exact same sizes"
+echo
+echo "3. 📋 Transfer data using block-level copy:"
+echo "   • Use dd to copy each snapshot to internal LV"
+echo "   • Process one LV at a time to manage space"
+echo "   • Remove each snapshot after successful copy"
+echo
+echo "4. ⚙️  Configure boot:"
+echo "   • Update fstab for new volume group"
+echo "   • Install GRUB on internal drive"
+echo "   • Update initramfs for LVM"
+echo
+echo "5. 🛠️  Setup snapshot tools:"
+echo "   • Install lvm-snapshot-manager"
+echo "   • Reserve space for future snapshots"
+echo
+
+echo -e "${RED}⚠️  CRITICAL WARNINGS:${NC}"
+echo "• Internal NVMe will be COMPLETELY WIPED"
+echo "• This creates an EXACT copy including all current data"
+echo "• Process takes 1-3 hours depending on data size"
+echo "• Snapshots use limited available space"
+echo
+
+echo -e "${GREEN}Advantages of Snapshot Method:${NC}"
+echo "✅ Exact bit-for-bit copy of live system"
+echo "✅ No filesystem corruption risks"
+echo "✅ Can capture running system state"
+echo "✅ Uses LVM native capabilities"
+echo "✅ Block-level transfer (faster than file copy)"
+echo
+
+echo -e "${GREEN}Post-Migration Capabilities:${NC}"
+echo "• sudo lvm-snapshot-manager create  - Create system snapshots"
+echo "• sudo lvm-snapshot-manager list    - Show snapshots"
+echo "• sudo lvm-snapshot-manager remove  - Clean up snapshots"
+echo "• sudo lvm-snapshot-manager merge   - Restore from snapshot"
+echo
+
+echo -e "${BLUE}Ready to proceed with snapshot migration?${NC}"
+echo "Run: sudo ./snapshot_migrate_to_internal.sh"
+echo
+echo -e "${YELLOW}Estimated time: 1-3 hours${NC}"