During its life, a sail has to take huge mechanical impacts. Your sail has been designed to withstand those impacts. Damages occur, when a sail has to take on loads for which it has not been designed.
To avoid damages, here are some tips:

Avoid fluttering sails or leeches Whenever you notice a fluttering leech, tighten the leech lines. To avoid fluttering sails, reef in time.
Avoid creases Make sure you either roll or fold your sail correctly .(Zig-Zag). Ideally an EPEX sail should be rolled from the top to foot, when going in to winter storage. This will avoid any permanent creases.
Use patches Wherever your sail may touch parts of the boat, like spreaders, reelings, pulpits, radars, etc, use insignia patches to protect your sail from unnecessary friction.