You open iTunes in your Mac or PC and you see that there are some updates available for your apps in your iPhone and/or iPad and you download them. When you try to sync these new updates, an error message similar to the one given below pops up:
Figure 1 : Not enough free space error in iTunes 
That’s annoying, right? Let me show you how you could get rid of this error message.
First, when you connect your iPhone and open iTunes, you will see a window similar to the one shown below:
Figure 2 : Summary window in iTunes 
Now, you might have noticed that the “Other” section in the storage bar is quite large. There is a simple trick to slightly reduce this amount:
- On your iPhone or iPad, tap on “Settings” and then on “Safari”.
- Then, tap on “Clear History and Website Data” and then tap on “Clear History and Data”.
- Reboot your iPhone.
Figure 3 : Clear Safari History and Website Data 
If this does not help much, you can restore your iPhone by clicking on “Restore iPhone” in iTunes. However, I would not recommend taking the second step if it is not crucial. Read this post further to find the explanation.
Try to sync your iPhone or iPad again using iTunes. If the error message shown in Figure 1 still pops up, try the following procedure:
Figure 3 : Sync Music in iTunes 
- Click on “Music” in the device section (a small phone-like button) in iTunes.
- Uncheck “Sync Music”
- Click on “Apply” and then on “Sync”.
- Check “Sync Music” and repeat step 3.
Hooray ! That annoying error message given in Figure 1 does not appear. Now you see why restoring the iPhone will not be necessary as mentioned previously.
Please note that this issue may arise occasionally. Hence the procedure given above will have to be performed when the error message pops up. Hope this helps.
 Why does iTunes say the nearly 3GB of free space on my iPad is not enough for the “1MB required” to sync? – Quora. 2016. Why does iTunes say the nearly 3GB of free space on my iPad is not enough for the “1MB required” to sync? – Quora. [ONLINE] Available at: https://www.quora.com/Why-does-iTunes-say-the-nearly-3GB-of-free-space-on-my-iPad-is-not-enough-for-the-1MB-required-to-sync. [Accessed 24 February 2016].
 7 tips to get rid of junk files and recover storage space on iPhone. 2016. 7 tips to get rid of junk files and recover storage space on iPhone. [ONLINE] Available at: http://www.idownloadblog.com/2015/11/17/how-to-iphone-storage-app-caches/. [Accessed 24 February 2016].
 How to clear Safari brower history on iPad?. 2016. How to clear Safari brower history on iPad?. [ONLINE] Available at: http://www.softwarert.com/clear-safari-history-ipad/. [Accessed 24 February 2016].
 Sync your iPhone, iPad, or iPod touch with iTunes using USB – Apple Support. 2016. Sync your iPhone, iPad, or iPod touch with iTunes using USB – Apple Support. [ONLINE] Available at: https://support.apple.com/en-nz/HT201253. [Accessed 24 February 2016].