Linux file backup

How to make daily file backups on Linux

Just configure the source the name and the output dir, schedule this script to run daily on crontab and it's done. Remember that retention policy is defined in days, so if you want more or less than what we have on the script, just change it to fit your priorities.

#!/bin/bash

SOURCE=
NAME=
OUTPUT_DIR=
WEEKLY_BACKUP_RETENTION=30 #DAYS
MONTHLY_BACKUP_RETENTION=365 #DAYS
YEARLY_BACKUP_RETENTION=3650 #DAYS

mkdir -p $OUTPUT_DIR/
mkdir -p $OUTPUT_DIR/daily
mkdir -p $OUTPUT_DIR/weekly
mkdir -p $OUTPUT_DIR/monthly
mkdir -p $OUTPUT_DIR/yearly

echo "STARTING $NAME BACKUP $(date +'%Y-%m-%d-%H-%M-%S')"

export WEEK_DAY=`/bin/date +%u`

# delete the old file

echo "DELETING $OUTPUT_DIR/daily/$NAME-$WEEK_DAY.tar.gz IF EXISTS FILE"
rm -f $OUTPUT_DIR/daily/$NAME-$WEEK_DAY.tar.gz

export DAY=`/bin/date +%d`
export MONTH_DAY=`/bin/date +%d-%m`

echo "GENERATING $OUTPUT_DIR/daily/$NAME-$WEEK_DAY.tar.gz FILE"
tar czf $OUTPUT_DIR/daily/$NAME-$WEEK_DAY.tar.gz $SOURCE/*

DATE=`/bin/date +%Y-%m-%d`

#####################
##   WEEK BACKUP   ##
#####################
if [ "$WEEK_DAY" == "7" ]; then
echo "DOING WEEK BACKUP OF $NAME"
cp $OUTPUT_DIR/daily/$NAME-$WEEK_DAY.tar.gz $OUTPUT_DIR/weekly/$NAME-$DATE.tar.gz
fi

#####################
##  MONTH BACKUP   ##
#####################
if [ "$DAY" == "01" ]; then
echo "DOING MONTH BACKUP OF $NAME"
cp $OUTPUT_DIR/daily/$NAME-$WEEK_DAY.tar.gz $OUTPUT_DIR/monthly/$NAME-$DATE.tar.gz
fi


#####################
##  YEAR BACKUP    ##
#####################
if [ "$MONTH_DAY" == "01-01" ]; then
echo "DOING YEAR BACKUP OF $NAME"
cp $OUTPUT_DIR/daily/$NAME-$WEEK_DAY.tar.gz $OUTPUT_DIR/yearly/$NAME-$DATE.tar.gz
fi

#####################
## RETENTION POLICY##
#####################

find $OUTPUT_DIR/weekly -type f -mtime +$WEEKLY_BACKUP_RETENTION | xargs rm -f

find $OUTPUT_DIR/monthly -type f -mtime +$MONTHLY_BACKUP_RETENTION | xargs rm -f

find $OUTPUT_DIR/yearly -type f -mtime +$YEARLY_BACKUP_RETENTION | xargs rm -f


echo "FINISHING $NAME BACKUP $(date +'%Y-%m-%d-%H-%M-%S')"