A couple of things to look at here. As per SAS Help Center: Backup and Restore: Perform a Restore to an Alternate Deployment check the section entitled "Prerequisites for Performing a Restore to an Alternate Deployment" and ensure you meet all listed.  You cannot use a different version of VIYA 3.5 between source and target.  Also note that as per SAS Supported Operating Systems you need to be on a  February 2021 release of SAS Viya 3.5 for RHEL 8.  Basically to put it another way the versions of the SAS Viya packages including the hot fixes must be exactly the same versions in both source and target deployments. For this to be an option you would need to have used a mirror repository for your current SAS Viya deployment and still have that mirror repository so that you could use it for the new deployment on RHEL 8. The order used to create the mirror repository would also have to be one that is supported for installation on SAS Viya on RHEL 8 so would need to be the February 2021 release of SAS Viya 3.5 or a later release.  ... View more