Backup file name: field is limited to 50 characters, and truncates additional characters

Under Backup section under "Backup File Name", the input field truncates input to 50 characters. In this field we can use tokens, but because of the limited field size, this in not very effective:

[site-date-yy][site-date-mm][site-date-dd]-[site-name]

becomes

[site-date-yy][site-date-mm][site-date-dd]-[site-n

This also breaks the last token!

Love the module, but this is real nuisance. Thanks for your help!