Created
February 23, 2024 01:27
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Script for backing up a folder, suitable as cron jobs
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| #!/bin/bash | |
| # Adapted from: https://wiki.postgresql.org/wiki/Automated_Backup_on_Linux | |
| set -e | |
| if [ $# -lt 2 ] ; then | |
| echo "$0 <SOURCE_DIR> <BACKUP_DIR>" | |
| exit 1 | |
| fi | |
| SOURCE_DIR="$1" | |
| BACKUP_DIR="$2" | |
| # Which day to take the weekly backup from (1-7 = Monday-Sunday) | |
| DAY_OF_WEEK_TO_KEEP=1 | |
| # Number of days to keep daily backups | |
| DAYS_TO_KEEP=7 | |
| # How many weeks to keep weekly backups | |
| WEEKS_TO_KEEP=5 | |
| function perform_backups() | |
| { | |
| SUFFIX=$1 | |
| FINAL_BACKUP_DIR="$BACKUP_DIR/$(date +\%Y-\%m-\%d)$SUFFIX" | |
| echo "Making backup directory in $FINAL_BACKUP_DIR" | |
| if ! mkdir -p $FINAL_BACKUP_DIR; then | |
| echo "Cannot create backup directory in $FINAL_BACKUP_DIR. Go and fix it!" 1>&2 | |
| exit 1; | |
| fi; | |
| echo "Performing backup" | |
| rsync -a "$SOURCE_DIR/" "$FINAL_BACKUP_DIR/" | |
| } | |
| # MONTHLY BACKUPS | |
| DAY_OF_MONTH=`date +%d` | |
| if [ $DAY_OF_MONTH -eq 1 ]; | |
| then | |
| # Delete all expired monthly directories | |
| find $BACKUP_DIR -maxdepth 1 -name "*-monthly" -exec rm -rf '{}' ';' | |
| perform_backups "-monthly" | |
| exit 0; | |
| fi | |
| # WEEKLY BACKUPS | |
| DAY_OF_WEEK=`date +%u` #1-7 (Monday-Sunday) | |
| EXPIRED_DAYS=`expr $((($WEEKS_TO_KEEP * 7) + 1))` | |
| if [ $DAY_OF_WEEK = $DAY_OF_WEEK_TO_KEEP ]; | |
| then | |
| # Delete all expired weekly directories | |
| find $BACKUP_DIR -maxdepth 1 -mtime +$EXPIRED_DAYS -name "*-weekly" -exec rm -rf '{}' ';' | |
| perform_backups "-weekly" | |
| exit 0; | |
| fi | |
| # DAILY BACKUPS | |
| # Delete daily backups 7 days old or more | |
| find $BACKUP_DIR -maxdepth 1 -mtime +$DAYS_TO_KEEP -name "*-daily" -exec rm -rf '{}' ';' | |
| perform_backups "-daily" |
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