mhm... in this case it means that the archive is really corrupted.
This happens when during the backup process a file gets truncated: when we start its size is (for example) 100Kb, then it shrinks. This will change the whole offset, corrupting your backup archive.
Do you have any chances to create a new backup? To be sure that this kind of errors won't happen again, you should enable the option
Archive integrity check inside the configuration page. In this way Akeeba Backup will try to extract the archive without creating any file and notify you if any error occurred.
Moreover you should try to identify the file that caused such problem and exclude it from the backup.
To do so, you should open the Kickstart.php file and uncomment (remove the two double slashes) the following line:
//define('KSDEBUG', 1);
In this way Kickstart will produce a debug file.
Please attach it here (zip it first), the latest lines will report the name of the corrupted file.
Davide Tampellini
Developer and Support Staff
🇮🇹Italian: native 🇬🇧English: good • 🕐 My time zone is Europe / Rome (UTC +1)
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!