I agree, Swift Backup is the best backup app and you don’t need the premium version to backup everything (unless you want to backup something to the cloud)
I use it to backup apps with Swift Backup, it’s not insecure as long as you don’t do silly things like modifying system files in a dangerous way, keep in mind that some banking apps and even games won’t work if they detect root.
/e/OS fixes captive portal and connectivity checks as far as i know