Hey there jharana273,
Thanks for reaching out to the Apple Support Communities. If having issues with creating an iCloud backup of your WhatsApp conversations, check out the following WhatsApp support resource that may help: Can’t create or restore an iCloud backup - WhatsApp Help Center
Can't create a backup
If you're unable to create an iCloud backup:
- Verify you're signed in with the Apple ID that you use to access iCloud.
- Verify iCloud Drive is turned on. Go to iPhone Settings > tap your name > iCloud > check that your iCloud Drive is on.
- Turn iCloud Drive off and back on. Go to iPhone Settings > tap your name > iCloud > turn iCloud Drive off and on.
- If you've turned on iCloud Drive for any device using your Apple ID, update to iOS 12 or newer to create a backup.
- Verify you have enough available space on your iCloud account to create a backup. You need to have at least 2.05 times the space available in your iCloud account than the actual size of your backup.
- If you're attempting a backup on a cellular data network, enable cellular data usage for iCloud.
- Perform a manual backup by going to WhatsApp Settings > Chats > Chat Backup > Back Up Now.
- Attempt the manual backup on a different network. Preferably the network you connect to the most.
If you’re still unable to back up your WhatsApp data after following the information above, please contact Apple Support: Get Support
We hope that's able to help.
Take care!