I can't remember a time where I didn't have issues with syncing apps. They always just seem to stop working and it's always frustrated me. It feels like to me there's too much complexity under the hood and it exhausts me when something goes wrong.

As a result I've been using rsync commands as a way to sync files and folders. After the initial setup, I haven't experienced any issues and it's been consistent and reliable. I even created my own tool which simplifies each rsync command into a file for easier syncing/restoring of my data. I use it to sync between my laptop, android phone using Termux terminal and my two Raspberry Pi's.

Rsync does have limitations like not being able to do two-way syncing but for my usage I am okay with that. I'm generally backing up data in most cases. Rsync does offer more flexibility since it's a command line tool so I'm able to create backups of my entire system or sync specific files and folders. I can also set up cron jobs to have syncs performed periodically but I mainly do all my syncing manually because I like to see where all my data is moving.

As long as all my devices have static IP addresses within the network and I don't mess around with any directory names/locations, everything just works and I've had a lot less headaches managing my data and backups. I also have a lot more confidence in my backup/restore process when compared to when I used other syncing programs/apps in the past.