tar + zstd - beat this!

Thank you!

Which 'cautionary tales', the search gave a couple results?

I use restic (https://restic.net/) which can use rclone to connect to a variety of backends (eg. onedrive, mega, dropbox etc.). Also, resticprofile (https://restic.net/) makes it easier to run (hides flags in the config file). I use it manually but a cron job would be easy to implement (a tutorial is here: https://forum.yunohost.org/t/daily-automated-backups-using-restic/16812).