Kaseya Backup Failed? Possible Solution here:

Recently we noticed a lot of server backup operations failed. We never got any problems before. After we did a thoroghly check, we found it was caused by the administrator account used to perform the backup operations. The password of the account was expired! It prevented the server backup software passing the credential check. So if you setup automatical server backup, please remember to set password never expire.

How to do it in command line:
You can use Net User command to create an account and set the account never expires.

For instance: To set an account "BackupAdmin" with the password "pwd123"

net user "BackupAdmin" "pwd123" /add /expires:never

Do not forget to add it to Administrators.

net localgroup "Administrators" "BackupAdmin" /add

Finally, use "Net Accounts" to set password never-expire

Net Accounts /MaxPWAge:Unlimited

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For a full explanation of Net User command, please click Here [From Microsoft.com].