You just set up a two way sync.

One folder- a Notes folder where all your "vault"s are- on your phone. That syncs with a folder on the cloud. Then get the sync app client on your laptop/PC. Then sync a local folder from your laptop with the cloud folder.

The Obsidian for desktop app is pretty great.

The whole thing works great for me.

So it's like this-

    _______                  _________________                        ________
    |phone |---------------> |cloud           |<--------------------- |laptop|
    |notes |  (2 way sync)   |folder of       |     (2 way sync)      |notes |
    |folder|<--------------  |MEGA/DB/box/sync|---------------------> |folder|
    -------                  ------------------                       --------

This method is tried and platform agnostic. All you need is a client that is available for your platform.

This is not my channel, but is a pretty good guide to set it up

It equates to basically standing up a new vault on an iOS device and choosing to store it in iCloud in the first place, then migrating the data over

https://www.youtube.com/watch?v=fqI4_gQqPQg

I’m iPhone & Pop_os! . There are some obsidian forum threads that can help, I think this is the one that I used for my setup (1).

It is not completely obvious in the UI, but the basic idea is that you use a iOS git app (I use the excellent Working Copy) to just push and pull everything to GitHub, working around some inherent iOS limitations. As a bonus, you can setup the Shortcuts app to auto push and pull with closing and opening obsidian. There’s a git sync extension for obsidian, makes it all pretty seamless once it’s set-up.

1. https://forum.obsidian.md/t/mobile-setting-up-ios-git-based-...

If you choose to straddle ecosystems there really isn't that much that the likes of Obsidian can do to help though (especially when it comes to iPhone). I use Obsidian with Mac + Android (Synced via Dropbox, and backed up using git) and it works. Little bit of manual setup, but I can handle that.

At the end of the day Obsidian is just a directory structure of Markdown files. If needed, you can edit them with Obsidian (say using the Dropbox app).

My method is platform agnostic.

You set up all your vaults under the same folder. You 2-way sync that folder to a cloud folder- Dropbox, MEGA, sync, box- whatever. You then create a folder with the same name on another device, and then use the client for your cloud service for that platform, and then set up two way sync with that folder on the cloud.

Works great with my Android-PopOS system.

Also tried it with Android-macOS, and iOS-Windows.