Installed regular HA on my Synology DS718+(DSM 7.1.1), with Docker, using instructions from mariushosting, no issues. After playing around I decided to move to HA Supervisor, again followed instructions to completely wipe the old container, images, network, etc. Fresh install of HA Supervisor gets me to the screen to select what data to share, and clicking “next” returns a “Failed to Save: Unknown Error” popup. Best guess is there’s some lingering footprint somewhere preventing the save action, but it had no issues with me creating the account and selecting my location. Any tips on how to investigate?
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Exactly the same here… Well, almost the same. Synology DS416play, 8GB. HA was fine, then tried HA Supervisor as described above. “Failed to Save” after creating account etc. I then tried reinstall, reboot and reinstall, and ended up removing all images on docker and removed Container. Installed Container Manager again, Portainer, HA Supervisor, but with the same result. Unfortunately I missed the fact that removing the containers also removed all backups - they are in the same folders on Docker that were gone 
I found the solution in Stuck on "onboarding.html"
I edited the file onboarding in /docker/homeassistant/homeassistant/.storage
old (resulting in failure):
{
"version": 4,
"minor_version": 1,
"key": "onboarding",
"data": {
"done": [
"user",
"core_config"
]
}
}
new (resulting in continuation)
{
"version": 4,
"minor_version": 1,
"key": "onboarding",
"data": {
"done": [
"user",
"core_config",
"analytics",
"integration"
]
}
}
Before editing I stopped all containers, just to be sure.
(I edited the file in Notepad++ on my pc)