Setup a cron job to export and upload a Postgres DB backup to a B2 bucket.
Setup B2
Install the B2 cli tool.
sudo apt install python3 python3-pip -y
pip3 install setuptools
pip3 install b2
b2 authorize-account $APPLICATION_KEY_ID $APPLICATION_KEY
Then paste the following into a .sh file.
#!/bin/bash
DB_NAME=mydb
FILENAME=${DB_NAME}_$(date +'%Y_%m_%d').sql
BUCKET_NAME=mybucket
USER=bob
pg_dump $DB_NAME > ~/$FILENAME
/home/$USER/.local/bin/b2 upload-file $BUCKET_NAME ~/$FILENAME $FILENAME
rm ~/$FILENAME
Then chmod +x the script, crontab -e and paste the following:
0 1 * * * /absolute/path/to/the/script
The script will run everyday at 01:00. You can then set custom lifecycle rules on Backblaze to retain backups for X number of days.