Unusually large Incremental file backups from one server

I have a few Windows servers backing up nightly but one is causing some issues. Every night the incremental file backup pulls almost 300GB of data from this one server even though this server doesn’t do all that much. The only thing I could think of is maybe the software it runs is dumping all of its stuff into large files that need to be completely backed up every night. Is this the case? Is there a way to troubleshoot this? Thanks for any info!