#!/bin/bash
#
# This script will gzip /mnt/backup/live/ 
# This script assumes /mnt/backup/snapshots/ is where we want to store archives 
# This script will only keep 7 days worth of archives
#   -- if you want to change this just change `MAX_BACKUPS` 
#
# My personal setup:
#   -- has this running daily with cron at 00:30z
#   -- mounts /mnt/backup to it's own specific NFS share configured for the host
# 

MAX_BACKUPS=7

tar -czf "/mnt/backup/snapshots/gwaine.snapshot.`date -Iseconds`.tar.gz" -C /mnt/backup/live .

COUNT=$(ls -1 /mnt/backup/snapshots/*.tar.gz 2>/dev/null | wc -l)

if [ "$COUNT" -gt $MAX_BACKUPS]; then
  # why not just delete the oldest file only Trey???
  # well I'll tell you why! If I want to change MAX_BACKUPS from 7 to 3
  # I'll have a whole bunch of extra archives I don't want to keep
  EXTRA=$((COUNT - MAX_BACKUPS))
  ls -1T /mnt/backup/snapshots/*.tar.gz | tail -n "$EXTRA" | xargs rm -f
fi