Sorry for taking some time with this. I need to get the help of one of the main developers and he's often pretty busy. Just wanted to let you know that I haven't forgotten about this and we'll try and recover your lost content as soon as we can!

Thanks to Minho for the sig!
Really cool they could backup your old version.
Considering it did happen once and your fear in case it happens again, I strongly suggest to do a copy / paste of your guide into a word file and save it so you have your own "back-up".
Moreover, you can save the file into a usb key or send it to any of your own mail so even after a hard drive crash, you could get it back from the usb key or from your mail account.
Advice which is true for any guide author, even without any glitch, it remains super useful to be able to come back to a previous version after change you regret.
Considering it did happen once and your fear in case it happens again, I strongly suggest to do a copy / paste of your guide into a word file and save it so you have your own "back-up".
Moreover, you can save the file into a usb key or send it to any of your own mail so even after a hard drive crash, you could get it back from the usb key or from your mail account.
Advice which is true for any guide author, even without any glitch, it remains super useful to be able to come back to a previous version after change you regret.
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https://www.mobafire.com/league-of-legends/build/7-24-make-riots-balance-team-tear-up-ryze-top-diamond-518619
- Thats the guide^