@kb-ohnemus
Update php4 to php5.
Get the tarballs from egroupware.
Rename the old egw folder in old.egroupware. Don't delete this folder, you'll need to know the rights and permissions.
Unzip the tarball in /opt. Follow the install procedure. (Discribed in the egw-manuals.)
You have to set the user as "egwuser" and the name of the database as "egroupware". You need to know the passphrase for the database. Have a look in the file header.inc.php from your old installation. Set rights and permissions very carefully.
Restore your backup in the new egw-version. Egroupware will convert the old tables in the new version. Test the installation.
ATTENTION: UPGRADING PHP4 to PHP5 might break your existing server installation. SME 7.4 does *NOT* support PHP5. You'll not be able to run further server-updates without special knowledge.
Works for me. SME 7.4, up-to-date.
stefan