try copying the files is smaller chunks. you only have 2.5GB free on the phone. 1400 files is much larger than that. The way iOS works the files are actually copied to the clip board then transferred to the wireless storage. then the clipboard is cleared. If the files you are trying to transfer exceed the amount of free space it can cause issues with completing the transfer. manually transfer the files in smaller chunks. Once you have transferred everything over to the wireless stick the auto backup should complete as the incremental data that will be backed up should be an overall smaller amount of data.
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