unable to back up iphone to mac

If an alert says that your backup is corrupt or incompatible

If your iOS or iPadOS device can't restore from a backup because the backup is corrupt or incompatible, make sure that your computer is updated. If you see an error that says your iOS or iPadOS software is too old, find out how to update your device to restore the backup. If you still can't restore the backup, you might not be able to use that backup. Try to use an alternate backup or an iCloud backup, or Contact Apple Support for more help.

If your iOS or iPadOS device can't restore from a backup because the backupis corrupt or incompatible, make sure that your computer is updated.

If you can't back up your iOS or iPadOS device to a ...

ILvMyMac Said:

"unable to back up iphone to mac: I purchased a new ipone and new mac. then i transfered using migration assistant on both the devices. [...]however when i click the "manage Backups" button in finder window there are no old backups....!!!"

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Transferring Data to New Devices:

The Migration Assistant would have transferred bata from prior backups. So, do you still. have your former phone will all of the data intact? If so, use Quick Start to perform the transfer: Use Quick Start to Transfer Data to a New iPhone or iPad - Apple Support