External hard drives for backups
Hi. I currently have a 2TB WD external HDD that I use for time machine backups for my iMac and my Macbook Pro. The HDD is however full and I'm looking at buying one with greater capacity. My question is: how many external HDDs do you have for backups? One? Two? I would also like to use the external HDD to store and edit photographs with Lightroom. Would you keep the time machine backups and the pictures all in the same HDD or would you use separate HDDs for time machine and pictures (It'd be good that the HDD for pictures was portable so I could travel with it)? Thank you very much.
iMac, OS X El Capitan (10.11.4)