Acer supports creating them but many pass it up. Order them if you forgot or lost them.
Other issues are: Not a stock set of RAM (hint: use stock sticks) and any USB device can cause recovery to fail (hint: unplug all USB things.)
Long story but cutting it short I wanted to use erecovery for a factory restore which I have successfully done once before,laptop running Windows 7, was working prior to running erecovery but using erecovery through Windows it stalled at 53% so I rebooted and had to use the alt and F10 hidden partition erecovery which also stalled at 53%, will recovery cd if I buy them also stall at 53%. Help please