Apart from paying £2k a year for a tool like ShareGate, what is the easiest way to copy content from one tenant to another?
If the volumn is low and not bothered about versions, metadata, content type or permissions then try SPFileZille @ http://spfilezilla.codeplex.com/, download to local machine, and upload to alternate tenant.
But if there is need to preserve ShareGate would be a good choice. Though I have not tried copy or move bewteen O365 tenants, it worked well in on premises scenario.
I suppose it would be possible with CSOM and/or PowerShell, not a technique I have tried.
Mike B
