As so many other people have also said, many Apple services like iCloud sync require a lot of network I/O. I use two iPads, one with 64G of storage and the othe

As so many other people have also said, many Apple services like iCloud sync require a lot of network I/O. I use two iPads, one with 64G of storage and the other with 1 terabyte of storage. Applications and data frequently get offloaded and reloaded on my old iPad. I appreciate hand-off, and accept the overhead for supporting that. Most data is encrypted at rest on Apple's servers and during transport. Check their documentation.