Acronis failed - No space Acronis Secure Zone
Why does Acronis NOT check for space in the Secure Zone before attempting backup, instead of attempting a backup, then aborting after a period of time of backing up my files ?
Personally I don't use, or recommend the use of secure zone. Secure zone does not protect against malware or the possibility of the secure zone partition from being mounted to attack it, modify it, or delete it. Also, as secure zone is on the same hard drive as the original data, it's a very poor choice - if the hard drive fails, you lose the original data and the backup.
Instead, you should look into a new portable hard drive (or NAS) and use that instead. You can secure your backups with 256-bit AES encryption in Acronis. Between that and Acronis Active Protection (AAP), you will be much better off and you will not have the headache of this proprietary, but accessible partition.
Once you have a good storage location, use the Backup task schedule options to automatically groom your backups and retain enough of them for your recovery needs. You'll want to ensure you have at least 3-4 times the amount of free space as your initial full backup to give you some room to keep some backups for retention. External hard drives are relatively cheap these days and you can usually find a 6TB one for around $100.
I agree that Secure Zone is not an ideal solution. Once it became economic to have multiple HDDs and the introduction of USB HDDs I gave up on using Secure Zone - I think it was Version 10. Using a NAS or USB HDD is a better option.