Additional backup directories to exclude

BackUpBuddy also creates a temp folder which we should exclude. Additionally there are some BackupWP directories which should be excluded.

```
/wp-content/uploads/pb_backupbuddy
/wp-content/uploads/backwpup-2d77ac-temp
/wp-content/uploads/backwpup-2d77ac-logs
/wp-content/uploads/backwpup-2d77ac-backups
/wp-content/uploads/backupbuddy_temp
```
This needs to account for the fact that `2d77ac` is a random string.