UCS files appear randomly in my Big-IP.

Hello,

I've set up a scheduled backups from Big-IQ, but I've observed the following behavior:

When Big-IQ fails to generate the backup, I find backups on my big-ip (in System > Archives)  .

Is this normal behavior? Typically, Big-IQ should generate backups of Big-IP devices locally, or should they also be generated on the Big-IP device itself?

Thanks in advance.