@timconsidine If you have any pointers regarding how to configure Volumes with Hetzner hosting, to store the Sync-in "drive files" in a dedicated volume instead of the main drive.
I've never used volumes, only tried it once and couldn't achieve what I wanted, I didn't understand how to backup them (you mentioned rsync, so I guess there isn't a native Cloudron-powered way to achieve that simply)
I'm really careful about backups and restoration, I must have confidence in how it's done to revert/reinstall if ever necessary.
Here is a bit of a feedback
So far so good, your install worked neatly once I upgraded Cloudron to 9.0.15, wasn't working on 7.7.2.
Hosted on Hetzner, costs me 2.99$/month for 40GB hard drive (cx23)

I also configured webdav, it was super simple on MacOS. This is what it looks like now:

Already reached my 40GB of disk size.
Some of my file uploads failed, it not always obvious why, there is no retry mechanism, and it's hard to identify the file/culprit.
- I've reached max disk size for one file (5GB left, 6GB file size)
- Google slides and other google documents failed to upload (.gslides)

The ability to sync folder-to-folder is just incredible, I've been using Sugarsync for the past 10 year just for that feature, costs me 100$/y. Having it on the mobile app was the only way I had to sync some internal apps folders to avoid content loss. The fact Sync-in doesn't have a native mobile app yet probably means I won't be able to achieve that with Sync-in yet (unless it's possible with the few apps mentioned in https://sync-in.com/docs/user-guide/mobile_apps), might be possible, though.
The ability to configure filters, per sync, is just so welcome, it's something I could never achieve with Sugarsync, typically. Made it utterly impossible to backup "dev" folders because I couldn't ignore huge subfolders like node_modules, .git, and the likes.

I was first surprised by how Sync-in uses a scheduler to run syncs, the default is 15mn. I find it way too long so I guess I'll just use 1mn on most folders, but the ability to customise it is really great. I'm used to have the files being synced as they are added, I wonder why they haven't made it that way and rely on a scheduler instead. But a 1mn delay isn't an issue at all I believe.

I was unsure how to use "Spaces" at first. Also, it's not obvious what should be inside the "Personal" folder.
As I plan on using this for my various companies (solopreneur), I first thought of using a different Space for each company, but I'm not sure to go about that way after all, as it doesn't seem possible to sync a whole folder directly as a Space. And Spaces are meant for collaboration and that's not something I need at this time. Also, the Personal folder allows to move some files into Spaces using Anchors so that offers very flexible options on the long run anyway.