Configure S.M.A.R.T. daemon for NAS at home and suspending discs

I have a question about my S.M.A.R.T. daemon configuration. I use two HDDs as RAID 1 observed with smartd. In general these are suspended, i just access them one time in two days. I've noticed the HDDs spin up every 30 minutes, because of some "checks".

• What do these checks do?
• What are offline tests for?
• What is the difference between short and long selftests?

I want to do a long test from time to time (e.g. once a month). I want to do a short test more frequently (once a week). It is useful to do an offline test daily? Is my configuration suggestive? Do -n suspend suppress short and long selftests, too?

DEFAULT -a -o on -S on -s (O/../.././03|S/../(1|8|22)/./03|L/../15/./03) -n standby -d sat -H -m <[email protected]>
/dev/sda -M test
/dev/sdc

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