Kup cannot backup another users home folder

Hi! This is my first post, btw :slight_smile: Also, I am quite a layperson when it comes to Linux.

My Kups backups on KDE Neon 5.27 don’t complete because of the following error:

bup "-d" "/media/backonmybs/BackupSSD/KDENeon Backup" "init"
bup "-d" "/media/backonmybs/BackupSSD/KDENeon Backup" "index" "-u" "/home"
b'/home/': [Errno 13] Permission denied: b'chamaco/'                  
read Linux attr: [Errno 13] Permission denied: '/home/chamaco/'       
WARNING: 2 errors encountered.

Exit code: 1
Kup did not successfully complete the bup backup job: failed to index everything.

The main account with admin rights is backonmybs, and it’s the one running the backups. The other account, which also has full admin rights, is chamaco.

How can I change permissions so that backups complete successfully, or is there another solution?