Zip backup, limitations

Hello,

I zip all my backups and send them to another server (not recommended, I know) but I wanted to restore a backup to a dev server just to test things out so here is what I did.

1. Copied a zip backup to the server

2. Unziped to backup and moved the zextras directory to /opt/zimbra/backup/zextras2

3. Changed permissions of the zextras2 folder to zimbra (chown)

Ran the import in Zextras, it finds all the domains and accounts BUT I get the following error:
"The operation couldn't be completed because you are trying to import data exported more than 30 days ago."

Do I have to have 2 valid licenses just to test if it's working?