Ashlands is too small to really let us do any QoL base stuff. To facilitate everyone in Ashlands we had to do the opposite and inflict damage over time to wards and workbenches there instead.
Only active outposts (daily repairs) will stay alive, i.e. you must actively repair your outpost every day.
When its destroyed, materials are dropped to the ground, but they also vanish after 60 minutes by valheim defaults if not inside workbench/ward radius.
Note: Wood burns in Ashlands so any wood components will be gone a lot faster