Phantom SQL Server database backups. How can I find the cause?
This looks like Veeam backups or some other third-party backup tool. Ask your systems guys if they take VM snapshots and backup the SQL server. Make sure you are VERY careful as Veeam can take FULL backups and break your differential base and possibly hose up your restore chain. I believe in Veeam they can do COPY_ONLY backups or set it to not truncate the transaction log, you'll want to make sure they aren't causing your well-planned restore strategy to go down the toilet in the event of disaster.