backup.sh

#!/bin/bash
set -x

log() { echo $*; }

HOSTS="host1 host2"
TODAY=$(date +%Y%m%d)
YESTERDAY=$(date +%Y%m%d -d '1 day ago')

for host in $HOSTS; do
  [[ ! -d "$host" ]] && mkdir "$host"

  cd "$host"

  if [[ ! -d "$TODAY" && -d "$YESTERDAY" ]]; then
      log "Using backups from $YESTERDAY"
      cp -r "$YESTERDAY" "$TODAY"
  elif [[ ! -d "$TODAY" ]]; then
      mkdir "$TODAY"
  fi

  log "Performing rsync of admin@$host:admin_backups/"
  rsync -avz --delete -e ssh "admin@$host:admin_backups/" "$TODAY/"

  log "Cleaning up folders older than 7 days"
  find . -maxdepth 1 -type d -mtime +7 -print -exec rm -rf "{}" \;

  cd -
done