Why are the permissions so broad on backintime folder?

Using backintime in SSH mode with full rsync option. Don't really understand what full rsync changes but I was convinced to click because it said it was going to be faster (and destination file system can handle it).

On first backup when the folder got created it was created with world-writeable permissions. That is unnecessarily broad and insecure. Is it really necessary?

$ ls -l backups/
drwxrwxrwx+ 3 <user> <group> 4096 Mar 24 10:26 backintime

$ ls -l backups/backintime/
drwxrwxrwx+ 3 <user> <group> 4096 Mar 24 10:26 <machine>

Only when I reach username that it is no longer world-writable:

$ ls -l backups/backintime/<machine>/
total 4
drwxr-xr-x+ 3 <user> <group> 4096 Mar 24 11:23 <username>

Of course I can seal my backups/ folder with:

    chmod go-rwx backups/

but saner defaults could be provided. If one would use BIP in an enterprise setting with all machines going to something like /var/backups/<machine>/ this means that any one could nuke each other's backups.

Thanks! (And thanks for BIP!)

edit: forgot to strip some of the identifying info