Is it really necessary to backup every time the wallet opens? There is a limit of one each minute, but wouldn't once per day be more reasonable?
The backups folder has an s. Bottom note might be better with this: Note: when you change the data directory for Dash with the command-line parameter '-datadir=newfolder' the backups folder will be created in that directory.
Otherwise, I really like that the extension isn't a .dat and that the .xx is a constantly changing number. - Makes it harder for an attacker to find a wallet when it isn't a defined extension.