diff --git a/simpleupdates/simpleupdated b/simpleupdates/simpleupdated
index 1359edc..d745564 100644
--- a/simpleupdates/simpleupdated
+++ b/simpleupdates/simpleupdated
@@ -1,14 +1,17 @@
 #!/bin/bash
 
-# Define the configuration and directories
+# Configuration and directories
 CONFIG_FILE="/usrdata/simpleupdate/simpleupdate.conf"
 GITUSER="iamromulan"
 GITTREE="main"
 DIRECTORIES=("simpleadmin" "socat-at-bridge" "simplefirewall" "tailscale" "ttyd")
 BASE_URL="https://raw.githubusercontent.com/$GITUSER/quectel-rgmii-toolkit/$GITTREE"
 
+LOG_FILE="/tmp/simpleupdate.log"
+
 # Wait for the system to fully start
 sleep 60
+
 # Load configuration
 if [[ -f "$CONFIG_FILE" ]]; then
     source "$CONFIG_FILE"
@@ -17,9 +20,32 @@ else
     exit 1
 fi
 
+# Redirect stdout and stderr to the log file
+exec > >(tee -a "$LOG_FILE") 2>&1
+
+# Function to trim the log file to the last 100 lines
+trim_log_file() {
+    tail -n 100 "$LOG_FILE" > "$LOG_FILE.tmp"
+    mv "$LOG_FILE.tmp" "$LOG_FILE"
+}
+
+# Validate only one update frequency is defined
+frequency_count=0
+[[ "$UPDATE_FREQUENCY" == "daily" ]] && ((frequency_count++))
+[[ "$UPDATE_FREQUENCY" == "weekly" ]] && ((frequency_count++))
+[[ "$UPDATE_FREQUENCY" == "monthly" ]] && ((frequency_count++))
+
+if [[ $frequency_count -gt 1 ]]; then
+    echo "Error: More than one update frequency is defined. Exiting."
+    exit 1
+elif [[ $frequency_count -eq 0 && "$UPDATE_FREQUENCY" != "none" ]]; then
+    echo "Error: No valid update frequency defined. Exiting."
+    exit 1
+fi
+
 # Function to check for updates
 check_for_updates() {
-    echo "Checking for updates..."
+    echo "$(date): Checking for updates..."
     for dir in "${DIRECTORIES[@]}"; do
         local remote_rev=$(wget -qO- "$BASE_URL/$dir/.rev")
         local local_rev_file="/usrdata/$dir/.rev"
@@ -40,13 +66,13 @@ check_for_updates() {
             echo "$dir is up to date."
         fi
     done
+    trim_log_file
 }
 
 # Function to wait and trigger updates based on scheduling
 wait_to_update() {
     echo "Waiting for the next update check according to schedule..."
     while true; do
-        sleep 60  # Check every 60 seconds
         local current_time=$(date "+%H:%M")
         local current_day=$(date "+%a")
         local current_date=$(date "+%d")
@@ -72,6 +98,8 @@ wait_to_update() {
                 exit 0
                 ;;
         esac
+        sleep 30  # Sleep for 30 seconds for more granular checks
+        trim_log_file
     done
 }