edit: one gotcha is that using "user" systemd units, they will only run when the user is logged in. So, for a personal device like a laptop, this is fine, but for a server, it might not do what you're thinking. For the server use case, you probably want to enable linger for that utility user, so that units will run even with no active logged in sessions:
https://fedoramagazine.org/automate-backups-with-restic-and-...
edit: one gotcha is that using "user" systemd units, they will only run when the user is logged in. So, for a personal device like a laptop, this is fine, but for a server, it might not do what you're thinking. For the server use case, you probably want to enable linger for that utility user, so that units will run even with no active logged in sessions:
# loginctl enable-linger username