I love utilities that quietly work, and just accept whatever workflow I throw at them.

OwnTracks is an app that logs your position and sends it somewhere else. It has been running on my phone for like 2 years without issues, and talks to a server I wrote myself.

FolderSync syncs folders on my phone to remote storage. It's super flexible and generally just works. The conditions for syncing are highly configurable. I lament the lack of a similar utility on Mac - basically an rsync+cron UI.