create_snapshot.py

#!/Users/anuragmathur/anaconda/bin/python
import boto3
import datetime
import pytz

ec2 = boto3.resource('ec2')

print "\n\nAWS snapshot backup startedi %s" % datetime.datetime.now()
instances = ec2.instances.filter(
	Filters = [{'Name':'instance-state-name', 'Values':['running']}])
for instance in instances:
	instance_name = filter(lambda tag: tag['Key'] == 'Name', instance.tags)[0]['Value']

	for volume in ec2.volumes.filter(Filters=[{'Name':'attachment.instance-id', 'Values':[instance.id]}]):
		description = 'scheduled_snapshot-%s.%s-%s' % (instance_name, volume.volume_id, datetime.datetime.now().strftime("%Y%m%s-%H%M%S"))

	if volume.create_snapshot(VolumeId=volume.volume_id, Description=description):
		print "Snapshot created with description [%s]" %description


	for snapshot in volume.snapshots.all():
		retention_days = 15
		if snapshot.description.startswith('scheduled_snapshot-') and ( datetime.datetime.now().replace(tzinfo=None ) - snapshot.start_time.replace(tzinfo=None) ) > datetime.timedelta(days=retention_days):
			print "\t\tDeleting Snapshot [%s - %s]" % (snapshot.snapshot_id, snapshot.description)
			snapshot.delete()

print "\n\nAWS snapshot backups completed"