Backup RDS automatic snapshots with manual ones that don't get deleted along with the instance

rdssnapshot.sh

#!/bin/bash 

: "${mysqlhost:?Need to set mysqlhost}"

#  example JMESPath input to --query
# 'DBSnapshots[?starts_with(DBSnapshotIdentifier,`rds:mysql-master-2016-02-14`)==`true`]'

mydate=`date -u +%Y-%m-%d`
region=`curl -s http://169.254.169.254/latest/meta-data/placement/availability-zone | sed 's/\(.*\)[a-z]/\1/'`

querypre='DBSnapshots[?starts_with(DBSnapshotIdentifier,'
querypost=')==`true`].DBSnapshotIdentifier'
query=$querypre\`rds:$mysqlhost-$mydate\`$querypost
# echo "using query: $query"


autosnapshot=`aws --region $region rds describe-db-snapshots \
--snapshot-type "automated" \
--db-instance-identifier $mysqlhost \
--query $query \
--output text`


if [ -v autosnapshot ]; then
  echo "found $autosnapshot"
  autosnapshotcopy=`echo "$autosnapshot" | sed 's/rds://' | sed 's/$/-copy/'`

  echo "copying to $autosnapshotcopy"
  aws --region $region rds copy-db-snapshot \
  --source-db-snapshot-identifier $autosnapshot \
  --target-db-snapshot-identifier $autosnapshotcopy
fi