daily backup for low vol user

[nalsdixit]

i have currently setup superduper to 'backup all files' automatically everynite via cronnix.

i wonder if this is overkill, and that rewriting my harddisk every nite is going to reduce the lifetime of it.

what i need to autoback up is the changes, new files made on the day. when i update, install new applications i can do a manual 'all files' cloning

should is switch to 'backup user files' ?, if so is backup new files, or backup different files the rite one to chose. i want to back up changes made to my hd during the day and any new files saved to it

on the reverse if 'backup all files; is the easiest/best option i am fine to stick to it

tks

nals