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Backup hangs at "preparing data"

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Leigh, sorry but simply too little information to work with here!

What Acronis application / version are you using here?
Is it ACPHO per the title of this forum area?
Is it Acronis True Image 2021 or an earlier version?
Is it an OEM version of ATI supplied with the purchase of new hardware / disk / SSD?

What are you backing up?
Is it the 'Entire PC' i.e. all internal disk drives?
Is it a single disk drive and its partitions?
Is it a Files & Folders backup?  If so, what Files & Folders are being included?

What are the backup task settings?
Full, Incremental, Differential backup scheme?
Is Automatic Cleanup enabled?
What Notifications being used, any Exclusions other than default settings?

What is the Destination for the backup?
How is the external drive connected?  USB, eSATA, across a network?
What is the file system on the external drive if connected directed to the PC?  NTFS, FAT32, exFAT?

Do any error message show when the backup stops?

The log files for the backup operation will contain the most relevant information on why the task is stopping?

You need to be using the new log viewer tool per the link below. 
MVP Assistant - a new tool, including new Log Viewer (Latest version 1.1.4.0, 9/27/2021)

If you have Disks & Partitions backups created on ATI 2020 or later using .tibx files, then look in the Backup Worker logs.

If you have Files & Folders backups using .tib files (or Disk backups from earlier versions using .tib files) or using Cloning then look in the Demon logs.

Other logs are shown by the MVP Assistant under the 'Active Logs' heading of the Log Viewer page of the Assistant.

The log files should be zipped to preserve their original file names if sharing in the forums and would need to be less than 3MB in size, otherwise you would need to share the zip file via a Cloud share service such as OneDrive, Dropbox etc.