Do not use Syncthing (2019)
gkayaalp.com
gkayaalp.com
I feel like that's the bigger takeaway. I've had issues with MEGA and Dropbox not syncing things correctly or getting caught in weird loops. I started using Syncing and now I have three tools.
Always do regular backups with something like duplicity. duplicity + backblaze works pretty well, and put a calendar event down to try a manual restore every month too. You can tell duplicity to discard older stuff and it will organize your snapshots correctly.
I need to do this myself too.