#!/bin/bash
# Please see the backup(8) man page for full documentation.

DATE=$(date +%Y%m%d)
BACKUPS=/var/backups
DUMPS=7

# Search for the last full backup.
LEVEL0=$(find $BACKUPS -name "*full.tgz" | sort | tail -n1)
# Search and count incremental dumps newer than the last full backup.
INCR=$(find $BACKUPS -name "*incremental.tgz" -newer $LEVEL0 | wc -l)

# If there is at least one full backup and less than specified incremental dumps
if [ ! -z $LEVEL0 ] && [ $INCR -le $DUMPS ]
then
  TYPE=incremental
else
  TYPE=full
  rm -f $BACKUPS/*.snapshot
  # Remove the first backup set (full and incremental dumps) if there is a second one.
  find $BACKUPS -name "*.tgz" ! -newer $LEVEL0 ! -wholename $LEVEL0 -exec rm {} \;
fi

nice tar -cz \
 --exclude ".nobackup" \
 --exclude "nobackup" \
 --exclude="/home/irc/*" \
 --exclude='/home/slip/*' \
 --exclude='/home/angelok/*' \
 --exclude='/home/ubergeek/*' \
 --exclude='/home/amcclure/*' \
 --exclude='/home/fosslinux/*' \
 --exclude='/home/zszoke/*' \
 --exclude='/home/duitser/*' \
 --exclude='/home/fltk/*' \
 --exclude='/home/nirvana/*' \
 --exclude='/home/transfusion/*' \
 /home/ \
 /var/games/minetest-server/.minetest/ \
 /var/lib/minecraft/paper/ \
 /var/lib/bzflag/ \
 /var/lib/znc/configs/ /var/lib/znc/moddata/ \
 /var/spool/cron/ \
 /var/spool/anacron/ \
 /var/lib/botany/sqlite/ \
 -g $BACKUPS/$TYPE.snapshot \
 -f $BACKUPS/$DATE-$TYPE.tgz

chown root:sudo $BACKUPS/{$DATE*.tgz,$TYPE.snapshot}
chmod 640 $BACKUPS/{*.tgz,$TYPE.snapshot}

if [ $TYPE = full ]
then
  cp -p $BACKUPS/full.snapshot $BACKUPS/incremental.snapshot
fi

# Database backup
find $BACKUPS -name "*.sql.gz" -mtime +$DUMPS -exec rm {} \;
mysqldump --all-databases | gzip > $BACKUPS/$DATE-all_databases.sql.gz

chown root:sudo $BACKUPS/$DATE*.sql.gz
chmod 640 $BACKUPS/*.sql.gz