zarafa-archiver -C
--local-only option to zarafa-archiver causes it to only cleanup the archives of users who have a store on the server to which zarafa-archiver is connected. This is the server on which zarafa-archiver is executed unless otherwise configured in the configuration file.
zarafa-archiver -C --local-only
zarafa-archiver -u <user name> -C
/etc/crontab.
0 3 * * 0 root [ -x /usr/bin/zarafa-archiver ] && /usr/bin/zarafa-archiver -C