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In The Practicing Photographer, photographer and teacher Ben Long shares a weekly serving of photographic instruction and inspiration. Each installment focuses on a photographic shooting scenario, a piece of gear, or a software technique. Each installment concludes with a call to action designed to inspire you to pick up your camera (or your mouse or smartphone) to try the technique for yourself.

– I recently had the great good fortune to take a trip to Scotland to do a long trek through the Highlands. Because of all the walking, I wanted to pack as light as possible and so I decided to take an iPad for my post-production instead of a laptop computer. This proved to be fine for the editing and post-production work that I wanted to do, but because my iPad has limited storage, I didn’t end up transferring everything that I shot to the tablet. Instead, I left all of my images on my media cards figuring that they’d be safe there until I got home. They were, by the way. There’s no sad ending to this story or anything.

But my normal workflow is to backup each card to my computer that I usually have with me as my cards fill up. I don’t erase the cards so I always have two copies of images while I’m on the road. When I get home, I move everything onto my various drives and backup drives at home. Since that trip, I have upgraded from the Fuji X-T1 that I was using then to an X-T2, which has two SD slots in it. You can see those right here. A lot of cameras these days have dual media slots. They’re maybe not necessarily SD, but one format or another.

For my next trip, I’m going to take a different approach to my media now that I have these two slots to ensure that I have backup capability as I go. If you have a camera with dual memory slots, then you may want to consider what I’m about to describe. By default, most cameras are set up so that if you put cards in both media slots, the camera will simply switch to the second card when the first one fills up. In other words, the two cards together give you one huge mass of contiguous storage. Through menus on the camera, you should be able to change how the camera utilizes its slots.

On this X-T2, one of my options is to mirror. Everything I shoot gets recorded to both cards, which means that as I go, I’m getting an automatic backup. I’ve done some testing with this camera and found that there’s no performance hit for recording to both cards. The camera’s burst speed does not slow down and the time needed to flush the buffer remains the same, so you really don’t suffer any penalties for doing this. In one regard, this isn’t a form of backup that is as secure as backing up to a drive because if I lose my camera, I’m losing both copies of my images, but it at least protects me from image loss due to a crashed or accidentally erased card.

It also of course means that I need to carry twice as much storage if I want to maintain a backup, but these days storage cards are cheap. And if it turns out that I’ve miscalculated on how much storage I need, then I’ve got a whole second set of cards. I’ll lose my back up then, but at least I won’t have to stop shooting. Dual slots let you maximize your storage in other ways. If you tend to shoot video alongside stills, then consider configuring your camera so that video files are stored on one card while stills are stored on another. This buys you a few advantages. First, it makes data management much easier.

If you know you’re not going to edit any of your video until you get home, then you can just ignore those cards while you’re on the road and only import your still image cards. Video often requires faster cards than still shooting, so by isolating your video work to a specific slot in your camera, you can ensure that you’re not wasting space on fast cards by storing still images there. If you’re like me, you shoot far more stills than video and so you can invest in an appropriate number of cards for each. Finally, if you’re a raw plus JPEG shooter, you can choose to store raws on one cards, and JPEGs on another.

For a lightweight, mobile approach, this can greatly speed up your post-production. Importing raw files into a phone or tablet is slow and it chews up storage. Sticking a JPEG only card into your tablet gives you the ability to maximize your storage, but if it turns out you need a raw copy of your image while you’re on the road, you’ve still got that on another card. Most cameras with dual slots offer options like these, so if yours does, check out your camera manual or simply dig around in the camera’s menus. Give some thought to how you shoot and what options might work well for you.

You might find that with the right configuration of slots, you can buy yourself a more efficient post-production workflow, the security of backup, or a combination of the two.