Or you can set your own password on Android, and therefore not require rooting. (WhatsApp gives you that option) I do that for my own backups. Download them via Google Drive [0] and then use this tool to decrypt them [1][2]

[0] https://github.com/YuriCosta/WhatsApp-GD-Extractor-Multithre...

[1] https://github.com/ElDavoo/WhatsApp-Crypt14-Crypt15-Decrypte...

[2] https://github.com/ElDavoo/WhatsApp-Crypt14-Crypt15-Decrypte...