diff --git a/cf-replace-ips.sh b/cf-replace-ips.sh
index 445431e..4287225 100644
--- a/cf-replace-ips.sh
+++ b/cf-replace-ips.sh
@@ -11,12 +11,18 @@ DEFAULT_CSV_PATH=""
 
 # Set default configuration file path
 CFG_PATH="./config.cfg"
+LOG_FILE="./cf-replace-ips.log"
 
 # Load configuration file if it exists
 if [ -f "$CFG_PATH" ]; then
   source "$CFG_PATH"
 fi
 
+# Function to log messages
+log_message() {
+  echo "$(date '+%Y-%m-%d %H:%M:%S') - $1" >> "$LOG_FILE"
+}
+
 # Prompt user for Cloudflare credentials
 read -p "Cloudflare email [${DEFAULT_EMAIL}]: " EMAIL
 read -p "Cloudflare zone ID [${DEFAULT_ZONE_ID}]: " ZONE_ID
@@ -27,6 +33,12 @@ EMAIL="${EMAIL:-$DEFAULT_EMAIL}"
 ZONE_ID="${ZONE_ID:-$DEFAULT_ZONE_ID}"
 API_KEY="${API_KEY:-$DEFAULT_API_KEY}"
 
+# Validate Cloudflare credentials
+if [[ -z "$EMAIL" || -z "$ZONE_ID" || -z "$API_KEY" ]]; then
+  echo "Error: Cloudflare credentials are required."
+  exit 1
+fi
+
 # Prompt user for A record modification details
 read -p "Subdomain to modify [${DEFAULT_SUBDOMAIN}]: " SUBDOMAIN
 read -p "Path to CSV file containing new IPs [${DEFAULT_CSV_PATH}]: " CSV_PATH
@@ -35,34 +47,62 @@ read -p "Path to CSV file containing new IPs [${DEFAULT_CSV_PATH}]: " CSV_PATH
 SUBDOMAIN="${SUBDOMAIN:-$DEFAULT_SUBDOMAIN}"
 CSV_PATH="${CSV_PATH:-$DEFAULT_CSV_PATH}"
 
+# Validate CSV file path
+if [[ ! -f "$CSV_PATH" ]]; then
+  echo "Error: CSV file not found at $CSV_PATH"
+  exit 1
+fi
+
 # Get existing A records for subdomain
-RECORDS=$(curl -X GET "https://api.cloudflare.com/client/v4/zones/${ZONE_ID}/dns_records?type=A&name=${SUBDOMAIN}" \
+RECORDS=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones/${ZONE_ID}/dns_records?type=A&name=${SUBDOMAIN}" \
               -H "X-Auth-Email: ${EMAIL}" \
               -H "X-Auth-Key: ${API_KEY}" \
               -H "Content-Type: application/json")
 
+# Check for API errors
+if echo "$RECORDS" | jq -e '.success == false' > /dev/null; then
+  echo "Error: Failed to retrieve DNS records. $(echo "$RECORDS" | jq -r '.errors[].message')"
+  exit 1
+fi
+
 # Extract existing record IDs
 IDS=$(echo "$RECORDS" | jq -r '.result[].id')
 
+# Backup existing records
+echo "$RECORDS" > "${SUBDOMAIN}_backup_$(date +%F).json"
+log_message "Backup of existing records saved to ${SUBDOMAIN}_backup_$(date +%F).json"
+
 # Delete existing A records for subdomain
 echo -e "\n\nDeleting existing records...\n"
 for ID in $IDS; do
-  curl -X DELETE "https://api.cloudflare.com/client/v4/zones/${ZONE_ID}/dns_records/${ID}" \
+  RESPONSE=$(curl -s -X DELETE "https://api.cloudflare.com/client/v4/zones/${ZONE_ID}/dns_records/${ID}" \
        -H "X-Auth-Email: ${EMAIL}" \
        -H "X-Auth-Key: ${API_KEY}" \
-       -H "Content-Type: application/json"
-  echo -e "\n"
+       -H "Content-Type: application/json")
+  if echo "$RESPONSE" | jq -e '.success == false' > /dev/null; then
+    echo "Error: Failed to delete record $ID. $(echo "$RESPONSE" | jq -r '.errors[].message')"
+    log_message "Failed to delete record $ID. $(echo "$RESPONSE" | jq -r '.errors[].message')"
+  else
+    echo "Deleted record $ID"
+    log_message "Deleted record $ID"
+  fi
 done
 
 # Add new A records for each IP address listed in CSV file
 echo -e "\n\nAdding new A Records for listed IPs...\n"
 while read -r IP; do
-  curl -X POST "https://api.cloudflare.com/client/v4/zones/${ZONE_ID}/dns_records" \
+  RESPONSE=$(curl -s -X POST "https://api.cloudflare.com/client/v4/zones/${ZONE_ID}/dns_records" \
        -H "X-Auth-Email: ${EMAIL}" \
        -H "X-Auth-Key: ${API_KEY}" \
        -H "Content-Type: application/json" \
-       --data "{\"type\":\"A\",\"name\":\"${SUBDOMAIN}\",\"content\":\"${IP}\",\"ttl\":1,\"proxied\":false}"
-  echo -e "\n"
+       --data "{\"type\":\"A\",\"name\":\"${SUBDOMAIN}\",\"content\":\"${IP}\",\"ttl\":1,\"proxied\":false}")
+  if echo "$RESPONSE" | jq -e '.success == false' > /dev/null; then
+    echo "Error: Failed to add record for IP $IP. $(echo "$RESPONSE" | jq -r '.errors[].message')"
+    log_message "Failed to add record for IP $IP. $(echo "$RESPONSE" | jq -r '.errors[].message')"
+  else
+    echo "Added record for IP $IP"
+    log_message "Added record for IP $IP"
+  fi
 done < "$CSV_PATH"
 
 # Save user input as default values in configuration file
@@ -71,3 +111,6 @@ echo "DEFAULT_ZONE_ID='${ZONE_ID}'" >> "$CFG_PATH"
 echo "DEFAULT_API_KEY='${API_KEY}'" >> "$CFG_PATH"
 echo "DEFAULT_SUBDOMAIN='${SUBDOMAIN}'" >> "$CFG_PATH"
 echo "DEFAULT_CSV_PATH='${CSV_PATH}'" >> "$CFG_PATH"
+
+log_message "Script execution completed successfully."
+echo -e "\nScript execution completed successfully. Logs saved to $LOG_FILE"
\ No newline at end of file