Security_Analytics_Release_Notes_7.3.2.pdf has the following description,
The backup and restore scripts inadvertently overwrote the postgres password, which prevented restoration.
Below is the scenario on the backup and restore scripts inadvertently overwrote the postgres password,
To fixed this issue, removed this file (postgresql.vault) from the backup.
You should be able to run this on the appliance before calling restore. I am using the backup filename solera-backup-sameple.tgz as an example.
cp solera-backup-sameple.tgz solera-backup-sameple-FIXED.tgz
tar --delete var/lib/aegis/postgresql.vault -f ./solera-backup-sameple-FIXED.tar
The new backup file will be name as solera-backup-sameple-FIXED.tar.gz.