Okay so I'm having major issues installing/running iTunes through Wine, but I'm in major need to create (and be able to restore from) a full, complete backup for my iPhone since I'm doing a ton of tweaking to it. I don't really know what I'm doing, so there's a 110% chance I'm gonna screw it up, but hey, no one ever learned anything about technology without crashing it a good 100 times right? =P
It's more recommend to create a VM and install iTunes on it, so that you can perform a full/complete backup.
To create a VM, there is a official doc via wiki: https://help.ubuntu.com/community/VirtualBox.
Another discussion: How to install Windows 7 inside Virtualbox of Ubuntu?
Hope this can help you.
It does appear that there is a backup utility for idevices although I admit I haven't tested it out yet. I found this though:
FonePaw iOS Transfer is an excellent iTunes alternative which can backup music, videos, playlists, photos, movies, TV shows, Podcasts, iTunes U, Voice memos, Audiobooks and more to PC with one click. You can use it to backup iPhone without iTunes.
• Click "To Folder" to backup iPhone to computer within seconds.
• Transfer music from iPhone to PC or iTunes;
• Copy all photos from iPhone to PC;
• Export contacts, SMS, videos, books to PC to backup.