What settings do I need to increase on zimbra (even if it's only temporary) to be able to import bit .tgz backups with zmmailbox?

I don't care if those values are outrageous, since it's gonna be done one time only.

I'm using

Code:
/opt/zimbra/bin/zmmailbox -z -v -m user@domain.com postRestURL '//?fmt=tgz&resolve=skip' /tmp/user@domain.com.tgz
to restore backups but I'm getting this memory limit error

Code:
ERROR: service.FAILURE (system failure: POST failed, status=413 upload too large: file '/': upload too large)
com.zimbra.common.service.ServiceException: system failure: POST failed, status=413 upload too large: file '/': upload too large
ExceptionId:main:1348140923644:e6893818208566e0
Code:service.FAILURE
	at com.zimbra.common.service.ServiceException.FAILURE(ServiceException.java:258)
	at com.zimbra.client.ZMailbox.postRESTResource(ZMailbox.java:2638)
	at com.zimbra.cs.zclient.ZMailboxUtil.doPostRestURL(ZMailboxUtil.java:3022)
	at com.zimbra.cs.zclient.ZMailboxUtil.execute(ZMailboxUtil.java:1305)
	at com.zimbra.cs.zclient.ZMailboxUtil.main(ZMailboxUtil.java:2903)