feat: ayaka supremacy

os/linux/backup.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+# Check if current user is root
+if [ "$(id -u)" -ne 0 ]; then
+    echo "This script must be run as root."
+    exit 1
+fi
+
+mkdir -p /mnt/backup
+cd /mnt/backup
+current_date=$(date +%F)
+# Backup
+echo "Creating backup of @root subvolume..."
+btrfs subvolume snapshot -r @root @root_backup_$current_date
+
+# Remove backups older than 7 days
+echo "Removing backups older than 7 days..."
+find /mnt/backup -maxdepth 1 -type d -name '@root_backup_*' -mtime +7 -exec "echo 'Removing {}' && btrfs subvolume delete {}" \;
+echo "Backup completed successfully."