Are domain & account aliases preserved in a ZxBackup incremental migration?

In setting up my Zimbra7 server, I'd created a number of alias domains,

zmprov createAliasDomain my_alias_domain.com my_real_domain.net zimbraMailCatchAllForwardingAddress @my_real_domain.net

as well as numerous mail aliases

zmprov aaa real_name@my_real_domain.net alias_name@my_real_domain.net

When using ZxBackup to do an incremental/live migration from this Z7 server to a *new* Z8 server, are these alias definitions -- for domains and accounts -- preserved & migrated?

I've not found Zextras documentation (yet) that says they are ...

or, do I have to extract lists from the Z7 server's localconfig, and then recreate them manually?

Thanks