Time Machine creates new backup copies until the drive is full, then
starts overwriting the oldest files duplicates.
Photography will probably call for quite a bit of HDD space, but maybe
you do not want to see the backup swell to 1 or 2 TB... Partitioning
the drive will limit the backup size (I'd suggest twice the laptop
drive capacity); on the other partition, you can setup a standard file
share.
Since the Apple partitioning tool erases the drive, make up your mind
as early as possible...

A cool and silent drive is preferable since the TM client starts every
15 minutes (30 ?) to refresh the backup. The Western Digital "green"
drives I've had for many years now fit perfectly the bill I think. A
laptop-sized HDD will be cool and silent as well, the largest ones are
1TB today. A "performance" drive is not needed at all.

If we're talking of an external USB drive, then I guess a laptop-sized,
self powered (via the USB plug) drive is the best option. "Self-powered"
should be advertized.

An ethernet cable is recommended if you opt for remote operation (Time
Capsule, but also Apple routers, some NASes, a hacked linux box can
host the TM backup service), at least for the initial backup which
covers over 100k files. After that, updates can probably go wireless.


-- 
epoch1970

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