tom_l
3
Can you connect via SSH?
Is the Pi actually booting (check the status LED)?
If not booting:
The 5.9 OS update has caused a bunch of peoples HA server to not boot.
Copy your snapshots from the SD card using a Linux PC or Windows PC running Linux Reader, or a Live Linux boot image.
Reinstall HA on the SD card. Restore your snapshot.
If it is booting and you can connect via SSH, check the logs for errors and proceed from there.
For future reference there are multiple ways to make and get your snapshots off the card automatically.
To a NAS: Samba Backup: Create and store snapshots on a Samba share
To Goggle Drive: Hass.io Add-on: Hass.io Google Drive Backup
To DropBox: Hass.io Add-on: Upload hassio snapshots to Dropbox
To NextCloud: [New Addon] Snap-Shipper - Webdav backups (and probably other ways to later on)
That is always the last resort as it can make the situation worse.