This image provides information to the backup program on how the mail store will be stored on the backup media. The actual mkbackupdir files are empty files. Backup groups are optional directories under which the mail folders for groups of users, say all users in a specific organization, can be placed. Creating groups is useful for scheduling parallel backups by group. The user directories contain the mail for each mail user.
Administrators can choose to backup at the user level or the mailbox level.
This will create a backup directory with mailboxes that have been modified since that date. Solstice only backup those mailboxes. Create user groups in the directory hierarchy. You can structure users into hierarchical groups in the directory. This allows you to backup specific groups of users.