So finally decided to mod my Switch. I am using a 32 GB SD Card, after backup ends I get 15 files (rawnand 0 to rawnand 14) all files are 2GB except the last is 1.4GB. When I use joiner for 15 2GB files it starts then it closes after a min. I am wondering if my backup is good as I read that it joiner failed then backup is bad. I have tried backip up twice but nothing. Any suggestions?