This source code is an example of taking an automatic on-demand backup of an RDS instance running in AWS VPC using AWS Python SDK (boto3). Alternatively 

$ python3 -V
Python 3.9.13
$ pip install -r requirements.txt --user
#find where to copy libraries - for example
$ python3 -c "import sys; print(sys.path)"
output: 

['', '/Users/skondla/miniconda3/lib/python39.zip', '/Users/skondla/miniconda3/lib/python3.9', '/Users/skondla/miniconda3/lib/python3.9/lib-dynload', '/Users/skondla/miniconda3/lib/python3.9/site-packages']

sudo cp lib/rdsAdmin.py /Users/skondla/miniconda3/lib/python3.9

['', '/Users/skondla/miniconda3/lib/python38.zip', '/Users/skondla/miniconda3/lib/python3.8', '/Users/skondla/miniconda3/lib/python3.8/lib-dynload', '/Users/skondla/miniconda3/lib/python3.8/site-packages']

#DB webApp
*/5 * * * * /usr/bin/flock -n /tmp/fullWebapp.lock python /data2/api/db/dbWebAPI.py > /data2/api/db/log 2>&1

#create cluster db snapshot  
curl -k https://10.10.x.x:25443/backup/create \
--data "endpoint=ecomm-integ-postgresdb-aurora.cluster-ro-vxt3omEzZi92f.us-east-1.rds.amazonaws.com"; \
--data "endpoint=ecomm-integ-postgresdb-aurora.cluster-ro-f657cdvjhwda.us-east-1.rds.amazonaws.com"; \
echo

curl -k https://10.10.x.x:25443/backup/status \
--data "snapshotname=ecomm-integ-postgresdb-aurora-snapshot-2019-06-23-22-21-57" \
--data "endpoint=ecomm-integ-postgresdb-aurora.cluster-ro-vxt3omEzZi92f.us-east-1.rds.amazonaws.com"; \
--data "endpoint=ecomm-integ-postgresdb-aurora.cluster-ro-f657cdvjhwda.us-east-1.rds.amazonaws.com"; \
echo

curl -k https://10.10.x.x:25443/backup/delete \
--data "snapshotname=ecomm-integ-postgresdb-aurora-snapshot-2019-06-23-22-21-57" \
--data "endpoint=ecomm-integ-postgresdb-aurora.cluster-ro-vxt3omEzZi92f.us-east-1.rds.amazonaws.com"; \
--data "endpoint=ecomm-integ-postgresdb-aurora.cluster-ro-f657cdvjhwda.us-east-1.rds.amazonaws.com"; \
echo

* Troubleshooting*

admin@ip-10-96-6-124:/data2/api/db$ ps -ef|grep dbWebAPI.py 
admin    13047 13042  0 21:00 ?        00:00:00 /bin/sh -c /usr/bin/flock -n /tmp/fullWebapp.lock python /data2/api/db/dbWebAPI.py > /data2/api/db/log 2>&1
admin    13051 13047  0 21:00 ?        00:00:00 /usr/bin/flock -n /tmp/fullWebapp.lock python /data2/api/db/dbWebAPI.py
admin    13054 13051  6 21:00 ?        00:00:00 python /data2/api/db/dbWebAPI.py
admin    13256 13054  6 21:00 ?        00:00:00 python /data2/api/db/dbWebAPI.py
admin    13454 12829  0 21:00 pts/0    00:00:00 grep dbWebAPI.py
admin@ip-10-96-6-124:/data2/api/db$ netstat -an | grep 10.78.2.42
tcp        0      0 10.78.2.42:25443       0.0.0.0:*               LISTEN     
tcp        0     36 10.78.2.42:22          10.200.209.167:63473    ESTABLISHED
udp        0      0 10.78.2.42:123         0.0.0.0:*                          
admin@ip-10-96-6-124:/data2/api/db$ lsof -i :25443
COMMAND   PID  USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
python  13054 admin    4u  IPv4  38308      0t0  TCP ip-10.78.2.42.datacube.com:25443 (LISTEN)
python  13256 admin    4u  IPv4  38308      0t0  TCP ip-10.78.2.42.datacube.com:25443 (LISTEN)