If you have backed up or exported an account and named the compressed backup file as backup.tgz, you can restore or import using zimbra webgui or CLI. CLI is the preferred method if involving backup file bigger than 500MB. The command is as below(run as user zimbra):
zmmailbox -z -m email@domain.com postRestURL "/?fmt=tgz&resolve=skip" backup.tgz
That's all there is to it.
