If you are moving from using UpdraftPlus for site backups to use either Time Capsule or WPVivid then this will cover how to remove any leftover data from the plugin. Compared to more recent backup plugins UpdraftPlus can cause some performance issues.
If you were using UpdraftPlus local storage method then the folder you will need to look for would be in;
Delete all of the files in that folder along with the folder itself. You could also delete the backup files in the UpdraftPlus backup settings if you wanted to run it that way. The UpdraftPlus will also set a number of options that will not be removed on plugin uninstall. The option names that you will need to look for using phpMyAdmin will be as follows;
Ideally, any of the backup plugins and cloud storage options you do not want to be storing backup files locally on your site’s server since over time these backups can end up taking up a lot of storage space. Take the time to test the right backup plugin and cloud remote storage option which works best for your child sites. It is also worth checking for the number of queries and memory the backup solution you pick is actually using and if it causes any issues in wp-admin on those sites.