hi my cache dir is now 7.0gb

du -ch | grep total 7.0G total

my host gave me advice that i can use cron to delete files older than 7 days by implementing this:

find /path/to/cache/folder/ -mtime +7 -delete

id like to ask thoughts on this? Is this a good idea?

also, i have set my Boost - HTML - Default maximum cache lifetime for html, json and xml all to 0. My thinking was this will cache everything and that's what i want, right? Is this a reason why my cache dir keeps getting bigger and bigger?

thanks so much.