Neilhunt

Use you phone, a card reader, and the hotel or campground Wi-Fi to get the pictures in the cloud. Daily or every few days. Google Drive via the Drive app is free (for enough photos for three weeks) and robust.

Personally I use mostly 32G or 64G cards, and don't recycle, so the old cards end up as yet one more backup...

BudsOwl Loc: Upstate NY and New England

For me, the more the merrier. I take 3 CF 32gb, 6 SD 32gb and 8 SD 16gb cards for my 5D IV and G15 when I go on a trip.
Bud

billnikon Loc: Pennsylvania/Ohio/Florida/Maui/Oregon/Vermont

I use the 64 card. And more is better.

Silverman Loc: Michigan

I have read that some feel that more "quality" 16gb cards are safer than keeping all your images on fewer but higher GB cards, such as the 32gb,64gb,128gb etc. Although it is a personal choice, if you will be including videos in your travels then maybe a higher GB card may be in order. Have a wonderful vacation, it sounds fantastic.

Silverman Loc: Michigan

Also, you might invest in a "Hard Case" that seals well and will "Float" if dropped in the water, to protect your memory Cards, All of you major Photography web sites offer good quality Hard cases to protect your very precious Memory Cards. B&H, Adorama, etc.

B&H # RUMCHSD12B MFR # MCH-SD12B

thegrover Loc: Yorba Linda, CA

I travel a lot with one or two Nikon D750's. I use 16GB cards. I bring 18 in two Think Tank Pixel Pockets, plus the two or four that are in my camera's. I would never use larger than 16GB for photo's. Two many eggs in one basket. I do not reformat until I have returned home and everything is backed up.

https://www.thinktankphoto.com/products/sd-pixel-pocket-rocket

thegrover Loc: Yorba Linda, CA

I about three weeks I am doing the Budapest to Amsterdam Viking River Cruise. I will be taking 22 16GB cards.

ICN3S Loc: Cave Junction, OR

I carry 4x32GB cards for most of my short trips. I have never had a card fail(knock on wood) but I always use second slot for backup RAW. Would like to add 2x64GB cards to my collection.

bpulv Loc: Buena Park, CA

I just got back from a 14 day trip to Europe this last Friday. I took my D800 with 64Gb CF and 64Gb SDHC flash memory cards with the camera set to backup the CF card to the SD card. In addition, I took a laptop and a few 128Gb USB flash memory drives to backup the camera's memories each night. That allows me to store over 4,000 RAW files on each if necessary. I typically make about 1,500 exposures a week because many of my pictures must be taken from moving tour busses. Since I transfer photos each night, the most I could loose in the event of a camera malfunction or theft is one day's pictures. I have never had a failure of any kind.

Many people will advise you to take several smaller cards and use a new one each day. I do not find that necessary or desirable from either a cost or connivence standpoint. I use only professional grade Sandisk memories which are expensive, but less expensive than seven smaller cards per week and present less cataloging and storage issues (small items get lost). I do not edit my photos on the computer while on the road, but I do separate them into file folders by date and subject for easier location when I return home.

JeffR Loc: Rehoboth Beach, Delaware

If you're traveling without a laptop, I'd recommend a RAVPower FileHub Plus. You can use it to backup your SD cards onto a thumb drive or USB hard drive, without any need for a laptop or an internet connection. I copy everything each night onto two 256GB thumb drives so that I have a backup, then reuse the SD cards. (Make sure you store the thumb drives separately, to protect against loss or theft.) You can get it on Amazon for $40. It is small and light-weight, it has an SD card slot and a USB port, and it doubles as a wireless travel router and a 6000mAh external battery pack. You control the file transfer with an app on your cell phone, and you can view your pictures on your cellphone to verify a successful copy. It connects with your cellphone through Bluetooth – you don't need to have cellular reception for it to work. It appears durable. I've tested it several times and it works as advertised. I've purchased several other RAVPower electronic items in the past from Sunvalleytek via Amazon and have always been impressed with the quality of their products and their customer service.

JohnnyRottenNJ Loc: Northern New Jersey

Maybe it's just me being a "belt & suspenders" type of guy, but if you are taking a once in a lifetime trip and are going to the trouble of shooting exposures in RAW mode, I would do two things. Bring at least twice the capacity in cards for the number of anticipated shots, AND I would invest in a portable, external HDD. I would upload the pics to the HDD every night, and then Lock and preserve the photos on the cards as they fill. SD cards are an awesome storage media, but they are easily lost, hence the external HDD. Just sayin'

Paaflyer Loc: Kansas City, MO

Better to have to many than not enough.

Should be “to have too many”. But i know what you mean.

bikerguy

I am surprised how many of the people responding go not back up their images each day but rather simply change SD cards. I can't envision a trip that I would take where I would not back up our images daily at least once and almost always twice. Cards get lost/misplaced or damaged. By having a backup on a portable hard drive and flash drives I am reasonably protected from loss. I use the Kingston Mobilite controlled by either my tablet or phone, it is wireless and works well. We generally back up our images during happy hour and/or dinner as necessary.

bpulv Loc: Buena Park, CA

Actually, I don't use the Internet when I travel. It is too risky.

Paaflyer Loc: Kansas City, MO

My feelings on the suject. If you buy a good brand, failure of a card is highly unlikely. I have several 32 gig cards. I shoot only RAW photos. My Nikon D7100 shows that I will get 596 shots. My cards are Sandisk Extreme 32 gig. I have shot and downloaded numerous times. No failures ever. This is important. Use your camera’s reformat feature to delete after downloading at home. Do it again before starting to shoot. If you have a good brand you should be safe.

I reread several times. Dont think there are any grammar errors. Feel free to correct me.