#!/bin/bash

DAY=`date +%d`

MONTH=`date +%m`

YEAR=`date +%Y`

# Backup directory to use (2011/08/31 for 08.31.2011)
BKDIR="/backups/$YEAR/$MONTH/$DAY"

if [ ! -d "$BKDIR" ]; then
        mkdir -p $BKDIR
fi

BKLOG="/backups/$YEAR/$MONTH/$DAY.log"

ARRPOS=0

DRIVE=('sda' 'sdb')

# What to back up on each drive?
BACKUP=('/' '/pub')

# Exclude these from / (sda)
SDAEX=('/media' '/tmp' '/dev' '/proc' '/sys' '/mnt' '/pub' '/var/cache' '/backups')

touch $BKLOG

echo "To: someone@somewhere.com" > $BKLOG
echo "From:Backups <backups@secrets>" >> $BKLOG
echo -e "Subject: Generated backup report for `hostname` on $YEAR.$MONTH.$DAY\n" >> $BKLOG

echo -e ">> Backup for: $YEAR.$MONTH.$DAY started @ `date +%H:%M:%S`\n" >> $BKLOG

# Checks to see if day = 1, and if so, backs up the last month's backups
if [ "$DAY" == "01" ]; then
        M=`echo -n $MONTH | awk '{printf substr($1,2)}'`
        let OLD=M-1

        echo "- New month detected.  Backing up previous month's ($OLD) backups." >> $BKLOG
        echo "   + Backup file: /backups/$YEAR/$OLD.tar.gz" >> $BKLOG
        SD=$( { time tar -cpPzf /backups/$YEAR/$OLD.tar.gz /backups/$YEAR/$OLD/; } 2>&1 )

        # Got stats, delete folder
        rm -rf /backups/$YEAR/$OLD

        SD=`echo -n "$SD" | grep real`
        MIN=`echo -n "$SD" | awk '{printf substr($2,0,2)}'`
        SEC=`echo -n "$SD" | awk '{printf substr($2,3)}'`
        echo -e "- done [ $MIN $SEC ].\n" >> $BKLOG
fi

tar -cpPzf /backups/$YEAR/$OLD.tar.gz /backups/$YEAR/$OLD/

# Cycle through each drive and back up each
for d in "${DRIVE[@]}"; do
        echo "- Backing up drive $d" >> $BKLOG

        # By default, at least don't backup lost+found directories
        EX="--exclude=lost+found"

        # If we are backing up drive 1 (/dev/sda), there's to exclude
        if [ $d == "sda" ]; then
                for e in "${SDAEX[@]}"; do
                        EX="`echo -n $EX` --exclude=$e"
                done
        fi

        # Do the magic work and display some cool info
        SD=$( { time tar -cpPzf $BKDIR/$d.tar.gz $EX ${BACKUP[$ARRPOS]}; } 2>&1 )
        SD=`echo -n "$SD" | grep real`
        MIN=`echo -n "$SD" | awk '{printf substr($2,0,2)}'`
        SEC=`echo -n "$SD" | awk '{printf substr($2,3)}'`
        SD=$(ls -liha $BKDIR/$d.tar.gz)
        SIZE=`echo -n $SD | awk '{printf $6}'`

        let ARRPOS++
done

for d in "${DRIVE[@]}"; do
        # By default, at least don't backup lost+found directories
        EX="--exclude=lost+found"

        # If we are backing up drive 1 (/dev/sda), there's to exclude
        if [ $d == "sda" ]; then
                for e in "${SDAEX[@]}"; do
                        EX="`echo -n $EX` --exclude=$e"
                done
        fi
done

# Mail this script out...ssmtp for GMail accounts, otherwise change for appropriate MTA
/usr/sbin/ssmtp -t < $BKLOG