On an overseas trip last year I brought a small laptop with Resolve installed and an external hard drive. After each day's shoot, I used Resolve's Clone Tool to copy (with checksum) the files from my SD cards to the external hard drive. I'm still using the Micro Cinema Camera, which records to SD cards. I actually had enough SD cards that I didn't have to reuse any of them so I had the originals on the SD cards and the backups on the hard disk. If I had to reformat the SD cards after each shoot I would have brought a second hard drive so I'd have two copies of everything. Or I would have kept backups of everything on the external hard drive and copies of the best takes on the internal drive of the laptop (assuming copious space available on the laptop, which isn't always realistic).
I use the Clone Tool rather than drag-and-drop, because it gives me the peace of mind that all my files copied correctly. Video files can be huge, and with files that size there's always a small risk of copy errors and you don't want to discover those after you've reformatted your original media. The downside is time; it takes longer to copy via the Clone Tool (or Shotput or Carbon Copy Cloner or any other checksum file cloning app). But charging batteries takes a long time too. I think my days worked out to maybe 2 hours of actual shooting followed by 4-5 hours of charging batteries, copying files, and entering metadata.