Can you ping home assistant?
Did you have SSH enabled?
Have you tried connecting via that method?
You can probably get the snapshots of the SD card using a Linux PC or using Linux Reader (free) on a windows PC.
Also there are many options to create and copy off your snapshots automatically:
To a NAS: Samba Backup: Create and store snapshots on a Samba share
To Goggle Drive: Add-on: Home Assistant Google Drive Backup
To DropBox: Hass.io Add-on: Upload hassio snapshots to Dropbox
To NextCloud or S3: [New Addon] Snap-Shipper - Webdav and S3 backups (and probably other ways to later on)