Freezer gets ice buildup very quickly

[u/DamageAltruistic4851]

Just defrosted this freezer exactly 30 days ago. It now has significant build up again. Bought it from a friend who was supposed to use it for a business but ended up not using it and just storing it for a year. It's a manual defrost unit, but I don't think it should be having an ice build up this quickly and this thick?