I have a very particular problem: I want to synchronize my Obsidian files across all of my apple devices (Replication), synchronize them to my non-apple devices (also Replication) and make sure they are backed up to protect from corruption or deletion (Backup).

I prefer to use native, free tools especially when they work well. In which case I ought to use iCloud for replication and Time Machine for backups. Unfortunately, iCloud doesn’t work with non-apple devices and Time Machine experiences a fatal corruption every 2-4 years¹.