Updates and improvements

install.sh
  installScripts function:
    update script not being copied over to /opt therefore update funcion was probably broken.
    changed script to copy all .sh scripts from .pivpn/scripts directory.

Issue #871: fix backup script
  I was probably very drunk when i first wrote this backup script.
  fixed it, now works with new code refactoring,
  loads vars from setupVars
  Added backup for wireguard
  Moved script to global pivpnscripts.
  Added backup script to bash-completion
  Added backup script to pivpn script

update.sh
  Commented the update from master branch to avoid users trying to update test from master.

Updated LatestChages.md

scripts/backup.sh

@@ -0,0 +1,52 @@
+#!/bin/bash
+# shellcheck disable=SC1091
+source /etc/pivpn/setupVars.conf
+# shellcheck disable=SC1090
+backupdir=pivpnbackup
+date=$(date +%Y%m%d-%H%M%S)
+
+checkbackupdir(){
+
+    if [[ ! -d $install_home/$backupdir ]]; then
+        mkdir -p "$install_home"/"$backupdir"
+    fi
+
+}
+
+backup_openvpn(){
+
+    openvpndir=/etc/openvpn
+    ovpnsdir=${install_home}/ovpns
+    checkbackupdir
+    backupzip=$date-pivpnovpnbackup.tgz
+    # shellcheck disable=SC2210
+    tar czpf "$install_home"/"$backupdir"/"$backupzip" "$openvpndir" "$ovpnsdir" > /dev/null 2>&1
+    echo -e "Backup crated to $install_home/$backupdir/$backupzip \nTo restore the backup, follow instructions at:\nhttps://github.com/pivpn/pivpn/wiki/FAQ#how-can-i-migrate-my-configs-to-another-pivpn-instance"
+
+}
+
+backup_wireguard(){
+
+    wireguarddir=/etc/wireguard
+    configsdir=${install_home}/configs
+    checkbackupdir
+    backupzip=$date-pivpnwgbackup.tgz
+    tar czpf "$install_home"/"$backupdir"/"$backupzip" "$wireguarddir" "$configsdir" > /dev/null 2>&1
+    echo -e "Backup crated to $install_home/$backupdir/$backupzip \nTo restore the backup, follow instructions at:\nhttps://github.com/pivpn/pivpn/wiki/FAQ#how-can-i-migrate-my-configs-to-another-pivpn-instance"
+
+}
+
+if [[ ! $EUID -eq 0 ]];then
+    if [[ $(dpkg-query -s sudo) ]];then
+        export SUDO="sudo"
+    else
+    echo "::: Please install sudo or run this as root."
+    exit 0
+  fi
+fi
+
+if [[ "${VPN}" == "wireguard" ]]; then
+    backup_wireguard
+else
+    backup_openvpn
+fi