Could not do a back up

[bbqbrisket]

I was trying to do a backup and I got a message that it could not do the fat32 files as there was not enough room.
Do I need the fat32 files to backup. If not, how do I exclude them? My thumb drive is 16gb.
thanks

 

[samuria]

What are you using to backup and what are you trying to backup ie doc,photos other

 

[file3456]

Can I get this post in English please? Describe your issue better.