Backup design flaw that can take the server offline

[ShoneA]

If any single user of ours decides they want to download a backup of their site, they will click the button and it will start like normal. Most times they will not understand that the server is working on preparing the tar file for them, so they will click the button again, which makes the server run slower. Every once and a while some person will click it many times which then knocks apache offline and possibly other services. This is a really bad design flaw.