Trouble backing up CUCM & Unity to NCM

I have complaint trying to backup CUCM 8.6 and Unity Connection to my NCM 7.2.2, where all my other Cisco backups live.

I can't get NCM's SFTP server to successfully backup ALL my CUCM and Unity files from the Disaster Recovery System interfaces.

I get probably two-thirds of the files backed up then the SFTP server just times out.

Is this a timeout issue or a file size cap or something else?