I have a 128GB uSD card in the drone (
P4P) and have never needed to swap it out during the day and only when I return at the end of the day do I remove it from the drone and copy the files to my PC. When travelling the PC is a laptop but when home its a desktop. I also make copies of the files onto removable HD's of 2TB and 4TB size. I have about 8 externals of 2TB or 4TB so I try to have three copies of all files. Some HD's are for my still images (DSLR's) and others for video and drone video. In addition to that I have a 512GB Samsung external SSD that I use mostly when travelling owing to the speed -- after a long day of shooting it can take hours to download and copy 100GB or mroe of video files between the drone and my 4K video/still camera (Panasonic G85).
My desktop has, at present, two 6TB HD's -- one for drone video and the other for my still and video cameras. I will probably need to add more storage within the next year. 4K video at 100Mbps eats through storage like its going out of style...
Brian