Archive Utility Unable to Extract

[SChaput]

I recently generated an entire backup of my website for safety purposes. As usual I deleted something that I realized I need, so i am trying to open up this .tar.gz file that i downloaded from my webhost. However, the mac Archive Utility always says, "Unable to unarchive backup" I have tried to downloaded BetterZip for mac and do it that way and i still get the same error.

Can anyone offer any advice to this?

Thanks

 

[SChaput]

Update:

I've tried to unarchive another file, downloaded from the same host, but much smaller and more bearable and i get the error:

Unable to archive "daily.tar" into Downloads. Error 1 - Operation not permitted