I'm going to be controversial, but I reckon cable actuated disc brakes are crap. They work well enough but just don't have the modulation and control of a well set up pair of dual pivot brakes.
Hydraulic discs, on the other hand, are superb and worth stretching the budget for if you can.
As with rim brakes, keep grit off the surfaces, just normal cleaning regime. Just give mine a blast with water once a week then drop the wheels out and clean disc and pads once a month.
I'm going to be controversial, but I reckon cable actuated disc brakes are crap. They work well enough but just don't have the modulation and control of a well set up pair of dual pivot brakes.
Hydraulic discs, on the other hand, are superb and worth stretching the budget for if you can.