Cant backup in iCloud…I have subscription also …

Learn what to do if you need help backing up your iPhone, iPad, or iPod touch with iCloud Backup.

If an alert says that there's not enough iCloud storage

Check how much iCloud storage you have available, then check your Next Backup Size. Then take steps to reduce the amount of information you store in iCloud, or upgrade your iCloud storage. 

Check your iCloud storage and Next Backup Size in iOS or iPadOS

1. Go to Settings > [your name].
2. Tap iCloud. The amount of iCloud storage that you've used is listed at the top. Learn more. 
3. Tap Manage Storage.
4. Tap Backups, then tap the device you're using. Next Backup Size is listed under Last Backup and Backup Size. 

It may take a few minutes for your device to calculate Next Backup Size. 

If your available iCloud storage is low

1. Make more space available in iCloud by reducing the size of your backup or deleting information that you don't need. 
2. Upgrade your iCloud storage plan.
3. If you still need help, contact Apple Support.

If a message says that your last backup couldn't be completed

1. Check that you're connected to Wi-Fi.
2. Ensure that your device is up to date.
3. Try to back up on another Wi-Fi network.
4. If you still need help, contact Apple Support.

If your iCloud backup is taking longer than expected to complete

1. Check that you're connected to Wi-Fi.
2. Check your upload speed.
3. Leave your device connected to power and Wi-Fi for 24 hours. If your backup still isn't done, archive important data then contact Apple Support. 

If the iCloud Backup option is greyed out

1. Check if a restore is already in progress. You can create a new backup after your device finishes restoring.
2. Check whether you installed a profile that restricts iCloud Backup. Go to Settings > General > Device Management to see a list of installed profiles. 

Get help restoring from an iCloud backup

If you need help restoring from an iCloud backup, learn what to do.