Edit: sorry, I’ve realised after writing this that I misread and the post was about hosting for sharing, not for backup and sharing between your own devices. I’ll leave my comment up in case it’s interesting anyway, but I wrote it thinking this was about having your vault synced across devices.
I’ve used a few things for both Logseq and Obsidian, Google Drive with the desktop app and FolderSync for android was the second best I’ve tried.
The best I’ve tried is Obsidian sync, so the few quid are worth it for me as it saves me a lot of hassle and I would say Obsidian is one of my top 3 used apps.
No