This is a simple script to automatically backup your IRC logs from multiple remote servers to a local directory.

backup-znc-logs.sh

#!/bin/bash
#title          :   backup-znc-logs.sh
#description    :   Create a local backup of all important ZNC accounts
#date           :   19.08.2014

# ------------------------- START CONFIG -------------------------

# Script home directory
# This is the directory where you want to store the directories containing your log files.
SCRIPT_HOME="${HOME}/Documents/Textual Logs/ZNC/"

# -------------------------- END CONFIG --------------------------

# Timestamp used to determine last backup.
today=$(date +%s)

# Get a list of all directories in the SCRIPT_HOME
# "ls -l $MYDIR"        = get a directory listing
# "| egrep '^d'"        = pipe to egrep and select only the directories
# "awk '{print $9}'"    = pipe the result from egrep to awk and print only the 8th field
DIRS=`ls -l "$SCRIPT_HOME" | egrep '^d' | awk '{print $9}'`

# Iterate through all directories in script home directory
for DIR in $DIRS
do
    # Check if .config-backup file exists
    # If it does, source the config file.
    if [ -f "$SCRIPT_HOME/${DIR}/.config-backup" ];
    then
        source "$SCRIPT_HOME/${DIR}/.config-backup"
        last_backup="$SCRIPT_HOME/${DIR}/$TIMESTAMP_FILE"


        # Function to backup logs and notify the user, all parameters need to be enclosed in tick marks (")
        # Important: Do not excape spaces in file or directory names.
        backup_logs () {
            servername=$1
            remotepath=$2
            localpath=$3

            # Notification center: Backup started
            /usr/local/bin/terminal-notifier -message "Backup $servername started." -title "ZNC Backup"

            # Start the transfer
            rsync -rhPt -e ssh "$remotepath" "$localpath"

            # Notification center: Backup done
            /usr/local/bin/terminal-notifier -message "Backup $servername done." -title "ZNC Backup"
        }


        if [ -f "$last_backup" ];
        then
            timestamp=$(tail -1 "$last_backup")

            # Calculate if last backup is older than 24h (86400 seconds)
            # Sync new logs if it's older than the specified timeframe.
            if [ $(($today - $timestamp)) -gt 86400 ]
            then
                backup_logs "$SERVERNAME" "$PATH_REMOTE" "$PATH_LOCAL"
            else
                echo "$SERVERNAME : Last backup < 24h old. Do nothing."
            fi
        else
            echo "$SERVERNAME : Timestamp for last backup not found. Creating new one."
            echo "$today" > "$last_backup"
            backup_logs "$SERVERNAME" "$PATH_REMOTE" "$PATH_LOCAL"
        fi
    else
        echo "$SERVERNAME : .config-backup not found. Please create one."
    fi
done