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In this stage, the user is likely to want to run `idevicebackup2` in interactive mode, so clearly specify the `-i` flag in the right place (just dropping `-i` at the end of the command does not work as expected -- i think `idevicebackup2 backup encryption on -i` tries to set the password to `-i`). More importantly, note that resetting the password by resetting all the settings runs a risk of removing some of the forensic information. Etienne identified a file that he thought was wiped as a result of this in the call this morning, but I don't remember which file it was. Maybe `id_status_cache.json` ? If you have more concrete info, please add it here too!
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Backup with libimobiledevice
If you have correctly installed libimobiledevice you can easily generate an iTunes backup using the idevicebackup2 tool included in the suite. First, you might want to ensure that backup encryption is enabled (note: encrypted backup contain more data than unencrypted backups):
idevicebackup2 -i backup encryption on
Note that if a backup password was previously set on this device, you might need to use the same or change it. You can try changing password using idevicebackup2 -i backup changepw, or by turning off encryption (idevicebackup2 -i backup encryption off) and turning it back on again.
If that fails, as a last resort you can try resetting the password by resetting all the settings through the iPhone's Settings app, via Settings » General » Reset » Reset All Settings. Note that resetting the settings through the iPhone's Settings app may wipe some of the files that contain useful forensic traces, so try to reset the device's password using idevicebackup2 as described above first.
Once ready, you can proceed performing the backup:
idevicebackup2 backup --full /path/to/backup/