Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
Veeam Backup and replication doesn`t support unlicensed (free) ESXi because it requires VMware APIs disabled.
But you can still back individual machines, using Veeam Endpoint Backup Free
If no Veeam jobs are running, you can delete the unneeded snapshot manually. Generally Veeam`s Snapshot Hunter deletes orphaned snapshots with no issues.
http://helpcenter.veeam.com/backup/80/vsphere/snapshot_hunter.html
What version are you at? You may also contact their support if the...