There are plenty of alternatives:
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)