On OSX yosemite, a machine with limited disk space free.
In order to backup my iphone, I've linked the ~/Library/Application Support/MobileSync/Backup dir to an external drive.
iTunes, correctly displays the existing backups in that dir.
But iTunes backup, fails with an insufficient disk space free.
Is it failing to check the free space on the volume that the Backup folder is on?
The boot volume certainly does not have enough free space.
How can I work around this, without deleting data?
osx: 10.10.3 (14D136) iTunes: 18.104.22.168