The automatic backup is triggered by the System - Backup on update plugin. If you do not want that backup to occur, you can disable the plugin. You really should have a backup before you upgrade.
It looks like you may be backing up multiple sites.
innovationspace.cl
elearning
If those folders are not part of your current Joomla! site, you can exclude them from the backup. It is a bad idea to back up multiple sites in one archive. It is usually easy enough to back them up, but restoring a single site is a nightmare.
If you do need those folders, you should try reducing the part size of the archive. Under Configuration, on the Archiver Engine line click Configure, then change the Part size for split archive to something lower than the current 1999.
Dale L. Brackin
Support Specialist
English: native
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!
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My time zone is
EST (UTC -5) (click here to see my current time in Philadelphia, PA)