Full backup random fails

SYSTEM INFORMATION
OS type and version Ubuntu Linux 22.04.1
Webmin version 2.001
Usermin version 1.860
Virtualmin version 7.3-1
Theme version 20.01.1:5
Package updates All installed packages are up to date

Random fails for 1 domain that has no ftp/email users. Email is also disabled for this domain.

Saving mail and FTP users …
… backup of mail failed : Failed to open /home/domain/domains/domain.com/.backup/domain.com_mail_users.webmintmp.69092 : No such file or directory

I can’t find anything in logs. I validated virtual servers. And suggestion? Thanks!