Can't Backup Jellyfin

[Hics]

Last night when I was trying to backup Jellyfin I ran into this error message: 

"Could not read /var/lib/jellyfin/.aspnet/DataProtection-Keys/key-*random string of letters and numbers*.xml"

I didn't include the exact random string of letters and numbers in case it has something to do with security. I've backed up Jellyfin multiple times in the last few years without running into this issue. Any idea how to fix it or if the .aspnet folder even needs to be backed up? 

Thanks!