You tap 'Back up' and nothing moves. The percentage has been the same for an hour, or it reached 100% and the notification won't leave. Or WhatsApp stops with 'Backup failed: You need more storage'.
Quick answer: a stuck backup is usually a space, connection or background-process problem, and the chats on your phone are normally untouched. Start with the gentle fixes below. Most of the damage here comes from the cure: deleting the old backup, uninstalling the app or forcing a new backup at the wrong moment.
Before you try anything: check your last backup and protect it
Warning: if chats are already missing from your phone, stop here. WhatsApp's help says not to delete your backup, create a new one or reset your device, because any of those can overwrite or permanently delete it. iCloud keeps one backup per account and a Google Account keeps one per phone number, so a new backup replaces the old one. That old backup may be the only copy of the missing chats.
If all your chats are visible, a new backup is what you want. Go to Settings > Chats > Chat backup on either platform and note the date and size of the last backup. The date shows how much you could lose, and the size shows how much space you need.
Make a free OneSol page: one link for Instagram, TikTok, WhatsApp and YouTube, with your forms and payments on the same page.Create your free page →Cause 1: Not enough storage in the cloud or on the phone
WhatsApp says 'Backup failed: You need more storage' means you have hit a storage limit. Android and iPhone store backups in different places, so check the right one.
Android: a backup in your Google Account counts toward your Google storage, which is shared with Gmail, Drive and Photos. Google says each account includes up to 15 GB, while new accounts created from March 9, 2026 start with 5 GB and can unlock 10 GB more by verifying a phone number. Some Android phones also offer WhatsApp's own cloud storage. If yours uses that, WhatsApp's help gives a free limit of 2 GB and lists paid plans.
iPhone: WhatsApp backs up to iCloud and says your available iCloud and iPhone storage should each be at least 2.05 times the size of the backup. A shortage on the phone matters too: WhatsApp notes that a partial backup can occur when the phone lacks storage.
- Android, check Google storage: open the Google One app and tap 'Storage'. Clear out large Drive files or Photos you no longer need, or buy more space.
- iPhone, check iCloud: open Settings, tap your name, then 'iCloud'. On iOS 17 or later, 'Recommended for You' suggests things you could remove. Apple warns that deleting from iCloud Photos or iCloud Drive removes those items from all your devices, so save anything you want to keep first.
- iPhone, check the phone: open Settings > General > iPhone Storage.
- Warning: don't delete your WhatsApp backup from Google to make room unless you accept the risk. Google says the deletion is permanent, and you lose all your chat history if you change phones or reinstall WhatsApp before you create a new backup. Unless you change your WhatsApp settings first, a same-size backup simply returns.
Cause 2: The connection or power keeps interrupting it
WhatsApp's iPhone help asks for a strong and stable internet connection, and its Android help warns that switching between Wi-Fi networks can make a backup time out. Work through these in order; none of them deletes anything.
- Restart the phone, then try the backup again.
- Turn Wi-Fi off and on, then stay on one strong network while it runs.
- Keep the phone plugged in.
- On Android, try mobile data if Wi-Fi is the weak link. Turn on 'Back up using cellular' under Chat backup. WhatsApp warns this can bring mobile data charges.
- On Android, force-stop WhatsApp from the phone's app settings and open it again. The exact menu varies by phone.
- If the bar reads 100% but the notification stays, wait. WhatsApp says background work such as media upload or download may still be finishing, and that the notification should clear within a few hours.
Cause 3: Videos and large media make the backup too big
Google says videos usually take up the most space in a WhatsApp backup. A smaller backup needs less room and less upload time, so shrinking it can help with both storage and stuck progress.
Warning: if you exclude videos, the next backup leaves them out and replaces the old backup, which may have included them. WhatsApp says videos are restored only if 'Include videos' was on before your latest backup. If you need a video, save it somewhere else first.
- Android: go to Settings > Chats > Chat backup and turn off 'Include videos in chats'. Then tap 'Back up'.
- iPhone: go to Settings > Chats > Chat backup and tap 'Auto backup', then turn off 'Include videos in chats'. For a one-off backup, tap 'Back up now' and choose the video option there.
- Clear out large files: go to Settings > Storage and data > Manage storage and sort by 'Largest'. WhatsApp recommends backing up before you delete content on iPhone, which is hard when the backup is what's stuck, so delete only what you're sure you don't need.
- Android cache: under the phone's Settings > Apps > WhatsApp > Storage, 'Clear cache' won't delete your messages or chats, according to WhatsApp. A nearby button labelled 'Clear storage' or 'Clear data' is a different thing. Don't tap that one.
Cause 4: Out-of-date software or a Google Account problem
If space and connection look fine, check the software and the account link. Update WhatsApp from Google Play or the App Store first, because it's the easiest thing to rule out.
- Android: check Google Play services for an update. WhatsApp gives the path Settings > Apps > Google Play Services; labels vary by phone. Install any system update your phone offers too.
- iPhone: WhatsApp lists the latest iOS as a requirement for iCloud backups. Go to Settings > General > Software Update. Apple notes you need enough free space to download the update.
- iPhone, check iCloud Drive: open Settings, tap your name, then 'iCloud' > 'iCloud Drive'. Turn on 'Sync this iPhone' and make sure WhatsApp is on under 'Apps Syncing to iCloud Drive'.
- Android, check the permission: in the phone's app settings, make sure WhatsApp's 'Photos and videos' permission is set to 'Allow'.
- Android, sync the account: in Settings under Accounts or 'Manage accounts', sync your Google Account and try again. WhatsApp's next step is to remove the account, add it back and select it again under Chat backup. Warning: Google says removing an account deletes everything associated with it from the device, including email, contacts and settings. Make sure you know the password first, and skip this step if chats are missing.
- Android, reinstall as a last resort: WhatsApp suggests it only if your chats and media are still on the device and a recent backup exists. Warning: if your last backup is old, anything newer that exists only on the phone is at risk.
If you use end-to-end encrypted backups
An end-to-end encrypted backup is locked with a passkey, a password or a 64-digit key. We didn't find anything in WhatsApp's help naming encryption itself as a cause of a stuck backup, so try the fixes above before you change this setting.
Warning: WhatsApp says that if you lose your password or key and can't access your WhatsApp, you can't restore that backup, and it can't reset the password or recover the backup for you. Your settings are under Settings > Chats > Chat backup > End-to-end encrypted backup.
- Forgotten password, WhatsApp still open: tap 'Change password', then 'I forgot my password'. Verify with your device PIN, passkey, password or 64-digit key and set a new one. WhatsApp says this doesn't unlock an existing backup. Restoring that one needs the original password, key or passkey.
- Trying to restore: you get five attempts at the password or key, then you have to wait before trying again. Don't make a new backup until you've tried the old one, because the new one replaces it.
- Turning encryption off: use 'Turn Off' in the same menu and confirm when prompted. You can turn it on again at any time.
Prevent it next time
A stuck backup is easiest to deal with when your last good one is recent. WhatsApp says that if your most recent backup is more than 120 days old, restoring may not be possible even if your account is still active. Google says backups not updated in 5 months may be automatically deleted.
- Set a schedule. On Android, choose a backup schedule other than 'Never' or 'Only when I tap Back up'. On iPhone, pick a frequency under 'Auto backup'.
- Check the last backup date under Chat backup now and then, so you catch a failure early.
- Keep free space above the backup size. On iPhone, aim for more than 2.05 times the backup in both iCloud and the phone.
- Store your encrypted backup password or 64-digit key somewhere safe outside your phone.
When you just need to hand someone a big file
If you only need to get one large video or file to someone, OneSol Send creates a link for files up to 5 GB, and the recipient doesn't need to sign in. You need a free OneSol account to send, and files are kept for 3 days, so it is for handing a file over. It is not a backup and doesn't replace your WhatsApp backup.