When backing up to the cloud, it doesn't actually generate the backup file in the cloud directly - it has to create the backup file on the device first, and then that file is uploaded. If your device doesn't support files larger than 4 GB, then it shouldn't be possible to backup to Dropbox. I'm surprised this didn't generate an error message of some kind though... I'm not sure I can explain that. The companion app is different - the backup file doesn't have to be created on the tablet first as the data can be streamed over WiFi to the companion app. There is no way it should take several days to backup over WiFi. Even with 2.4 Ghz wifi, the transfer rate is around 8 MB/s. With 5 Ghz, it's going to be much faster.
I always planned to try to allow backups to be spread over multiple files, but due to the fact that the vast majority of Android devices use exFat and can write files larger than 4 GB, I decided it wasn't worth the effort.
Mike
I always planned to try to allow backups to be spread over multiple files, but due to the fact that the vast majority of Android devices use exFat and can write files larger than 4 GB, I decided it wasn't worth the effort.
Mike