MySQL 5.7.33 on Ubuntu Server 16.04 LTS - Backups filling drive

I tried searching here but couldn’t find an article already about this.

I’ve got UrBackup setup to take backups of my MySQL 5.7.33 server on a Ubuntu Server 16.04 LTS using Percona.

The backups themselves seem to continually be stored in this location, even after the backups complete:
/var/lib/mariadbbackup

This location takes up 202.1 GB currently while the DB location only takes up 46.6 GB.

Should this location not be emptied after a successful backup?
Should it really be the cause of my disk space being used up this much?

Please help, don’t know anything about Percona.

Is anyone able to provide something to look at?

Is this a bug?