HowTos/BackupRestore
From Scalix Wiki
Exporting/Importing user account data
To export/import a single user's mailbox to a dump file, the omcpoutu/omcpinu (Scalix < 11.0) or sxmboxexp/sxmboximp (Scalix >= 11.0) can be used. Please see the respective man pages for details.
Handling large mailboxes
The dump files that omcpoutu creates are limited in size to a maximum of 2GB, i.e. you will get an error message if you try to export a mialbox that is larger than this size.
However, with Scalix versions of 9.4 and later, you can redirect the output of the command to "Standard Output" and then redirect the output to a file on the OS side. This will allow for backup and restore of large mailboxes.
Examples: