Screenshot is in German, but you can specifically choose what files to include:
Database
Plugins
Themes
Uploads
…
This would be very useful for MainWp as well.
When updating Themes or Plugins, I usually only backup the database and plugins / themes files.
There is no need to backup the uploads folder.
Also, you can label the backups.
Essentially UpdraftCentral uses the same widget / popup that is used, when using the UpdraftPlus plugin directly.
After that, if there are discrepancies between the options offered by the extension and the plugin, please take screenshots of it and report them here.
If you have suggestions about features that UpdraftCentral has, and you’d like to see us implement, please suggest them on our official feedback site: https://feedback.mainwp.com
That way, others can vote for it, letting us know which features our users want the most.