Snapshot plugin can't write to folders

The file permissions for these folders are 755. I'm not sure if that is the problem or if it's something else? Here is the error message I'm getting:

ERROR: The Snapshot destination folder is not writable /home/elitehom/public_html/bestdenverproperties.com/wp-content/uploads/snapshotsERROR: The Snapshot destination folder is not writable /home/elitehom/public_html/bestdenverproperties.com/wp-content/uploads/snapshots/_backupERROR: The Snapshot restore folder is not writable /home/elitehom/public_html/bestdenverproperties.com/wp-content/uploads/snapshots/_restoreERROR: The Snapshot destination folder is not writable /home/elitehom/public_html/bestdenverproperties.com/wp-content/uploads/snapshots/_logsERROR: Cannot create snapshot Log folder. Check that the parent folder is writeable /home/elitehom/public_html/bestdenverproperties.com/wp-content/uploads/snapshots/_logs/_sessions

Thanks.