Space problems for two backups when only one is configured

Hello and first of all, congratulations for this magnificent plugin.
I have contracted 5 GB of space for a website that occupies 2.3GB, so I have Updraftplus configured so that it only saves a copy on the server.
The fact is that every so often, the hosting alerts me and blocks the site due to excessive use of space, and I need to access by FTP to delete copies that are left half, because as I seem to understand, until a second copy is finished, it does not delete the previous one, so it causes space problems in the hosting and that seems to break the process of the last copy.

Is there any way to avoid this problem? I would not want to expand the disk space, when I still have more than 50% of the free space.

Greetings.

The page I need help with: [log in to see the link]