"My phone is already jailbroken. I would like to know if it is still okay to back up data? And will it affect my data in my backup?"
For many reasons iPhone users want to jailbreak their iPhones such as iPhone 6s Plus/7/7 Plus and even the new iPhone 8/X. Jailbreaking gives you more freedom to customize your iOS device in every way possible. So there is an increasing number of users who are intended to jailbreak their device. However, after jailbroken, the iPhone may fail to be backed up by some certain apps and programs. If you want to back up a jailbroken iPhone, FonePaw iOS Data Backup & Restore is recommended.
FonePaw iOS Data Backup & Restore allows you to back up iPhone photos, contacts, music, SMS, videos, etc. to an external drive directly, which means that you don't need to move iTunes backup files from computer to external drive afterwards. Even though a jailbroken phone is supported.
Note: Only if your iPhone/iPad is running iOS 6 to iOS 11, this method is fully compatible.
Back Up a Jailbroken iPhone
Step 1. Download and Install iOS Data Backup & Restore
Click the Download button above to get FonePaw iOS Data Backup & Restore installed on your computer. Then click and open the program.
Step 2. Connect iPhone to PC
Connect your jailbroken iPhone like iPhone 7 to the computer via a USB cable. After that, there should be a dialogue box that pops up on your iOS device, asking you whether to trust the computer or not. To ensure successful connection, tap "Trust".
Step 3. Get into Homapage
Go to "More Tools" to enter "iOS Data Backup & Restore" homepage to begin backup your jailbroken iOS device.
Step 4. Click Start to Back Up
You can do a common backup with "Standard backup" or protect the vital data with "Encrypted backup" which will require you to set a password for the backup.
Step 5. Choose Data to Keep
When your iPhone is detected, you can see many data types compatible with this tool. Just choose ideal contents with ticking the boxes and hitting "Start". Then, the data will be backed up quickly.
That's all. You can check your backup in the FonePaw iOS Data Backup & Restore. One day if files are deleted from your jailbroken iPhone, you can restore with the backup.