user warning and check for rsync installed

Author: dmitreiro

README.md

@@ -5,7 +5,7 @@ This service performs a schedule system backup using `rsync` and sends Telegram
 
 ## :gear: Setup
 
-:warning: **Warning**: before you proceed, make sure your Linux OS uses `systemd` as a service manager.
+:warning: **Warning**: before you proceed, make sure your Linux OS uses `systemd` as a service manager and you have `rsync` installed in your system.
 
 Open terminal, change your current working directory to the location where you want the cloned directory and then clone this repository to your local machine
 

install.sh

@@ -12,6 +12,12 @@ if ! command -v systemctl &> /dev/null; then
     exit 1
 fi
 
+# ensure rsync is available
+if ! command -v rsync &> /dev/null; then
+    echo "Error: rsync is not available on this system."
+    exit 1
+fi
+
 echo "Starting system-backup installation..."
 
 # creating configuration file