@flamshun: jetfin's case is a bit particular, he was using usbnetwork, and messed with the system rootfs without taking note/making backups relating to his changes.
Most users should only bother with backuping their documents folder & collections (system/collections.json).
The jb/ss/fonts hack from this thread *do NOT* make any potentially problematic changes to the system rootfs, so there's no need for more involved backups.
Last edited by NiLuJe; 10-23-2010 at 06:37 PM.
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