Update README

Author: spithash

README.md

@@ -8,6 +8,7 @@ The script will use gzip to create .gz archives of your files.
 Packages **pv & gzip** are required to be installed on your system because they're needed for the progress bar and archive creation of your files and .sql databases.
 Use your favourite package manager and install them.
 On Debian this should do: **sudo apt install pv gzip**
+Also, **sudo** is required. We need it so we can backup system files.
 
 # MySQL/MariaDB
 The script will ask for mysql user and password confirmation each time you dump a database.