Timeslops 2018 Backup issue

Client is running Timeslips 2018. They can not do a backup from within Timeslips. They get an error. It doesn't matter where we try to do the backup to. They have full permissions and there is adequate space. For name, I just used Test. There's no security turned on in Timeslips. Ideas? 

Error is:

cannot create backup. possible reasons may be
    - path to server backups may no exist
    - Database security restrictions
    - Not enough Disk space
    - Network restrictions
    - Illegal file name"