simple backup script wrapping tarsnap

tarsnap-backup.sh

#!/bin/ksh
#
# compile tarsnap, and install it to $BASEDIR
#
# put the files/dirs to be included into $BASEDIR/includes
# specify exclude patterns in $BASEDIR/excludes
# both files should contain either space or newline-separated items
#
# tweak $DELETE_ARCH to specify the retention time after which the
# archives will be deleted
#
# deletion of archives is lazy, only one at a time. i do consider
# this a feature
#
PATH="${BASEDIR}/bin:${PATH}"

HOST="$(hostname)"
BASEDIR="/root/tarsnap"
EXCLUDE_FILE="excludes"
INCLUDE_FILE="includes"

DATE_TEMPLATE='date +%Y%m%d'
ARCH_NAME="${HOST}-$(${DATE_TEMPLATE})"
DELETE_ARCH="${HOST}-$(${DATE_TEMPLATE} --date='5 days ago')"

tarsnap --configfile ${BASEDIR}/etc/tarsnap.conf -cf "$ARCH_NAME" \
        --one-file-system \
        $(sed 's/\(^\| \)/ --exclude /g' ${BASEDIR}/${EXCLUDE_FILE}) \
        $(cat ${BASEDIR}/${INCLUDE_FILE}) \
        &>${BASEDIR}/log/${ARCH_NAME}
        
tarsnap --configfile ${BASEDIR}/etc/tarsnap.conf -df $DELETE_ARCH \
        &>>${BASEDIR}/log/${ARCH_NAME}