I'm TV technician, but I don’t know how to save or protect the boards in my workshop
For long term storage, what I usually do is put the item in an anti-static plastic bag, put some desiccant packets if available, then seal it (video) using an impulse sealer. This method has yet to fail me.

The plastic, desiccant, and impulse sealer can be acquired for cheap, at least in the Philippines.