Well just gone through the upgrade process on a fresh instance through Hetzner to Ubuntu 24.04:
Upgraded to Cloudron 8.0 and took backup to storage box. Downloaded the backup metadata file. Wiped server with ubuntu image from Hetzner and apt failed to do upgrade, moaned about missing files on the mirror. Tried to resolve but I wanted to try out an iso installation from Ubuntu directly rather than using the Hetzner images anyway so gave that a go. Installing from ISO is actually easier than I thought it would be, there was no messing around with the routes as discussed in Hetzner docs. IPV4 works out of the box, I decided to take the netplan config file supplied by Hetzner's imaging process for my server and used that on the fresh Ubuntu install to get IPV6 working. After wiping and reinstalling the new system I changed the SSH port and then ran Cloudron-setup. It installed 8.0 for me as it detected a Ubuntu 24.04 install. In the setup wizard clicked on the restore option and supplied the file. Realised then I didn't have my storage box password so had to change that in the interface. However once changed the restore happened and all my apps were back in around 15 minutes.Nice work guys, and I've always wanted to test the bear-metal restore from backup.