1.9 backups were either stored in the course ID folder of moodledata and in a backupdata folder ... so /moodledata/#/backupdata/[backup.zip_file]
If running automated backups then they are all in whatever directory the auto backups are pointed to.
In a shell (ssh) and located in the moodledata directory:
ls -lR ?/backupdata/*.zip
will show all the single digit course ID numbered folders backupdata and the zip files contained therein.
Example output:
-rwxrwxrwx 1 apache apache 23830 Aug 27 2009 1/backupdata/backup-k12os-foss-20090827-0940.zip
-rwxrwxrwx 1 apache apache 52643 Mar 8 2012 1/backupdata/backup-k12osfoss-20120308-2303.zip
-rwxrwxrwx 1 apache apache 1615 Oct 24 2008 2/backupdata/backup-sa-20081024-2049.zip
-rwxrwxrwx 1 apache apache 4299038 Mar 8 2012 3/backupdata/backup-mtools101-20120308-2303.zip
-rwxrwxrwx 1 apache apache 158503 Aug 27 2009 3/backupdata/backup-tteksglossaries-20090827-0940.zip
-rwxrwxrwx 1 apache apache 16165 Mar 8 2012 6/backupdata/backup-ma101-20120308-2303.zip
-rwxrwxrwx 1 apache apache 1729 Jun 6 2010 7/backupdata/backup-sa-20100606-1309.zip
For double digt course ID numbered folders:
ls -lR ??/backupdata/*.zip
For triple digit course ID numbered folders:
ls -lR ???/backupdata/*.zip
One could move or copy them to another archive folder. Below shows copy ... but one could use rm rather than cp -p to remove. rm will prompt you for yes/no response.
cp -p ?/backupdata/*.zip /home/backups/
repeat for ?? and ???
'spirit of sharing', Ken