Fix typos and improve Docker availability checks in backup scripts

backup.sh

@@ -5,7 +5,8 @@ if [ "$1" = "local" ]; then
 elif [ "$1" = "restic" ]; then
     source /backup_restic.sh
 elif [ "$1" = "loop" ]; then
-    # Inifinite loop to keep the container running and let Ofelia scheduler (or any other) manage the execution
+    # Infinite loop to keep the container running and let Ofelia scheduler (or any other) manage the execution
+    echo "Entering infinite loop mode. Use external scheduler to trigger backups."
     while true; do
         sleep 86400
     done

backup_local.sh

@@ -16,7 +16,8 @@ if [ -z "$TARGET_DIR" ]; then
     exit 1
 fi
 
-if [ ! `docker info` ]; then
+docker info > /dev/null 2>&1
+if [ ! $? -eq 0 ]; then
     echo "Docker is not available."
     exit 1
 fi

backup_restic.sh

@@ -22,7 +22,8 @@ if [ -z "$RESTIC_REPOSITORY" ]; then
     exit 1
 fi
 
-if [ ! `docker info` ]; then
+docker info > /dev/null 2>&1
+if [ ! $? -eq 0 ]; then
     echo "Docker is not available."
     exit 1
 fi