My next challenges are definitely backups.
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Server backups (Hetzner): Hetzner has built-in backups, this is great if something really wrong happens to the hosting server, but cannot be used outside Hetzner. I'm not entirely sure how useful it is but feels like a must-have for critical servers such as this. I haven't found a way to customise how often the backups run and it only keep the last 7. Feels useful to have around, but definitely not sufficient.
️ And this won't backup the Hetzner Volumes, only the main disk.
I'm not sure if it's useful in combination of Cloudron backups and Volume backups, may be overkill.

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Backups of Cloudron apps: Setting up Cloudron backups to an AWS S3 is rather simple. I wonder if Sync-in has it's own backup system to setup.
By default, they are stored in the same server (locally) and it's a weakness (weak resilience) that must be addressed, to avoid issues such as Hetzner's datacenters taking fire and losing apps and backups at once.

What I usually do is to configure a remote backup destination, usually using a different provider, to mitigate risks, such as AWS in another EU region. Done it plenty of times, not particularly difficult.
️ But this won't backup the Hetzner Volumes, only the main disk. -
Backups of Volumes: Need to learn how to do that, @timconsidine mentioned using a Hetzner Storage Box as a backup destination, using rsync to perform the actual sync.
I've never used Hetzner Storage Box, but it looks great at first glance. It supports WebDav natively. Great if ever needed to quickly access the backup on any computer, as a remote disk. (typically to copy some files/folders directly from the backup)This will likely be the most challenging (at least for me).
Price for 1TB is 3.2€/month, AWS S3 Glacier Flexible Retrieval is priced at 4.05$/TB/month, while S3 Glacier Deep Archive is 1,8$/month.

Backups (and a proper/clear) restoration protocol are very important. Especially so as I haven't seen any concept of "file history" in Sync-in. It doesn't seem possible to revert a file to a previous version at this time. 
It's only possible to restore a deleted file.









)
(grinning like a Cheshire one)


