Hello,

We provide a plugin for this task : https://www.projeqtor.net/en/shop/plugins/backup-database-detail
Also this post may help you : https://www.projeqtor.org/en/forum/9-tips-tricks/243-back-up-restore

Thank you for the quick response and feedback. I will check it out and get back to you should I have any further questions.

Thanks again.

Could I trigger or schedule a backup using phpMyAdmin using cron in Projeqtor?

Absolutely not.

Using Cron in Projeqtor to execute backup is exactly what our DB Backup plugin does 😉

Understood. Do we have the ability to develop our own plugins?

Yes.
Projeqtor code is open source, you can read and analyze it to write your own code.
And use of plugin system is the best way to develop your own code without having to change projeqtor code.