(begging forgiveness, I haven’t read the comments yet).
Regarding backups - I started with using Ubuntu and its Backup application. This application is a front end for a command line package called Duplicity. One of the things that annoyed me about the backup app was that I couldn’t work out how to reschedule the scheduled backup.
Taking control of my own backup setup was the answer. Learn about bash scripting so you can create a short bit of code to handle your backups. Read up a little on duplicity, read up a little on mounting remote file shares, read up a little on setting up an ssh key for encrypting your backup.
This may be an heretical thing to say but I found ChatGPT quite useful in answering these questions (as always with anything you get from an LLM, double check it’s answers against reliable sources).