Hi michiil
You could do that, but if you ever start using a browser it could result in some huge slow backups and restores.
I'd first see if being more specific helps, like:
var/lib/bluetooth/00:15:83:D2:28:ED/cache/
or:
var/lib/bluetooth/00:15:83:D2:28:ED/cache/00:04:20:F2:46:E6