feat: Small code improvements

src/lib/backup.sh

@@ -294,8 +294,10 @@ gen_backup_name() {
 
     # Overwrite __name_date_fmt
     if [ -n "$name_date_fmt" ]; then
-        __name_date_fmt="$name_date_fmt"
+        date_fmt="$name_date_fmt"
+    else
+        date_fmt="$__name_date_fmt"
     fi
 
-    date +"${prefix}${name}${__name_date_fmt}${name_ext}"
+    date +"${prefix}${name}${date_fmt}${name_ext}"
 }

src/lib/common.sh

@@ -34,7 +34,7 @@ log() {
     [[ ! -t 0 ]] || [[ "$#" == 0 ]] && message="$(cat <&0)"
 
     # Set log date format
-    [ "$log_date_fmt" ] || log_date_fmt='%d/%b/%Y:%H:%M:%S %z'
+    [ "$log_date_fmt" ] || log_date_fmt="$__log_date_fmt"
 
     while (( "$#" )); do
         case "$1" in