Sooner or later, you’ll unintentionally overwrite your work, or worse yet, your equipment will fail or be stolen. Online back-up software now makes this nearly brainless. There are several providers. If you work in sensitive fields, look for one that offers end-to-end encryption, meaning that the staff people at the server farm can’t even read your data. SpiderOak is a great example, although I admit that they like to sell you more space by not helping you configure your backup to overwrite previous backup versions. Oops. I still use it because of their commitment to working data-blind as your vendor. But another option is to carry an inexpensive and portable external hard drive or flash drive. I currently carry a 1-terabyte drive (huge by any standard) that I think I picked up for $100. It’s about the size of a small smart-phone. (We live in an amazing age, eh? My first portable computer was a KayPro II, roughly the size of a large suitcase! It had NO hard drive and the “floppy disks” each stored about as much memory as one small Facebook picture. Yikes.) Again, make sure you sort this out before your trip and practice using it. Several vendors now offer high-speed SD cards (which are about the size of a small coin!) that can store as much as 128Gig without any moving parts. USB sticks offer that much and more, if you have a USB port on your device (all of them should!).
Here is another angle to consider. It’s a hard pill to swallow when a terabyte of info gets lost if you accidentally drop an external hard drive. (ask someone who’s done it) Maybe 2 smaller drives would be a better option? At least you’d only lose 1/2 as much info. I have a hard time getting anything over 500GB for just that reason. The LaCie brand has a heavy duty rubber casing that holds up well or something similar may be worth considering.