Add backup guide

[upintheairsheep]

Can you create a guide on how to back up your device, and link to it on every jailbreak page? I would personally recommend an iTunes/Finder backup before jailbreaking, to prevent jailbreak files "poisoning" future backup files and making it unable to restore to a non-jailbroken reset. If the user does not own a computer, uses an iPad as their only computer, uses ChromeOS, or does not have the necessary storage for a backup, using the iCloud Transfer feature to get free infinite backup storage for a single iCloud backup.

Many viewers come directly from Google or another search engine for an installation guide, and not have any backup warnings. The first step should always link to the backup page.

[bradleytechman]

When unjailbroken, restoring rootfs and varclean on newer jailbreaks should remove 70% of remnants. If not all of it is still gone, then a restore should get rid of it, but then as mentioned you can't restore from a backup. I agree a guide for this maybe should be present, but I'm not sure.