I’ve seen contrasting advice from LM on cleaning. I suspect the instructions might be aimed at commercial use as it advises flushes with cleaner every day… but my process is as follows - (I make about 2-4 espressos day and top up the water with Waitrose Lockhills once a day.)
Daily - just briefly flush the group (not backflush) between shots and I’ll rinse the PF under the group after the last shot of the day. Some people like to backflush with water each day but I’ve never seen the need or any negatives from not doing it.
Weekly - Empty / wipe tank (whilst connected) with a damp cloth (no detergent). Remove screen/screw and wash with dish soap, also wash PF properly. Wipe group under screen and use brush to clean around the seal. Baskflush 4× 10 secs with water. Drain 500ml from steam boiler, run steam for 20 seconds and properly wipe down wand. We use oat milk exclusively so easier to clean wand.
Monthly - Soak PF in Puly Caff (or LM cleaner), backflush with Puly Caff, remove water tank and clean with dish soap (NOT with Puly Caff!!), rinse everything properly and repeat weekly cleaning routine above. I’ll also run a shot of espresso through and discard it after properly cleaning.
Yearly - I haven’t got to this point yet but I’ll be replacing screen/gasket, removing lid to inspect, clean as above.
Some more info here: https://au.lamarzoccohome.com/wp-content/uploads/2017/06/cleaning-procedure.pdf
If I’m going away then yep, I just empty tank and drain boilers as fully as possible and then do a weekly style clean when I’m back.