Serious Update Problem: Site Backup/Restore attempt - Now gives server 500

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We had a client, who being a member of the Administrators group attempted what looks like a backup/restore after which submitted a support ticket with us about their site giving a 500 error.

I have tried to fix this but have no idea where I am looking or whats actually causing the error.

I do have a backup but its 2 months old and missing a serious amount of work we have done since (200+ pages of translation).

Can anyone point out what may have gone wrong?

Starting again is not an option this time I'm afraid the site has over 700 pages of content.
[Sat Mar 16 15:29:56 2013] [error] [client 188.127.99.34] PHP Fatal error:  Maximum execution time of 30 seconds exceeded in /var/www/vhosts/mysite.com/httpdocs/updates/concrete5.6.0.2/concrete/libraries/3rdparty/adodb/drivers/adodb-mysql.inc.php on line 739
[Sat Mar 16 15:31:01 2013] [error] [client 188.127.99.34] PHP Fatal error:  Maximum execution time of 30 seconds exceeded in /var/www/vhosts/mysite.com/httpdocs/updates/concrete5.6.0.2/concrete/core/libraries/backup.php on line 141, referer: http://www.mysite.com/dashboard/system/backup_restore/backup/
[Sat Mar 16 15:35:51 2013] [error] [client 188.127.99.34] PHP Fatal error:  Allowed memory size of 67108864 bytes exhausted (tried to allocate 8029604 bytes) in /var/www/vhosts/mysite.com/httpdocs/updates/concrete5.6.0.2/concrete/libraries/3rdparty/adodb/adodb-exceptions.inc.php on line 78, referer: http://www.mysite.com/dashboard/system/backup_restore/backup/
[Sat Mar 16 15:36:03 2013] [error] [client 188.127.99.34] PHP Fatal error:  Allowed memory size of 67108864 bytes exhausted (tried to allocate 8029604 bytes) in /var/www/vhosts/mysite.com/httpdocs/updates/concrete5.6.0.2/concrete/libraries/3rdparty/adodb/adodb-exceptions.inc.php on line 78, referer: http://www.mysite.com/dashboard/system/backup_restore/backup/
[Sat Mar 16 15:36:19 2013] [error] [client 188.127.99.34] PHP Fatal error:  Allowed memory size of 67108864 bytes exhausted (tried to allocate 8029604 bytes) in /var/www/vhosts/mysite.com/httpdocs/updates/concrete5.6.0.2/concrete/libraries/3rdparty/adodb/adodb-exceptions.inc.php on line 78, referer: http://www.mysite.com/dashboard/system/backup_restore/backup/
[Sat Mar 16 15:37:30 2013] [error] [client 188.127.99.34] PHP Fatal error:  Call to a member function overrideCollectionPermissions() on a non-object in /var/www/vhosts/mysite.com/httpdocs/updates/concrete5.6.0.2/concrete/core/models/permission/assignments/area.php on line 33, referer: http://www.mysite.com/
[Sat Mar 16 15:37:40 2013] [error] [client 188.127.99.34] PHP Fatal error:  Call to a member function overrideCollectionPermissions() on a non-object in /var/www/vhosts/mysite.com/httpdocs/updates/concrete5.6.0.2/concrete/core/models/permission/assignments/area.php on line 33, referer: http://www.mysite.com/dashboard/system/optimization/clear_cache/cache_cleared/
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lots more of the Call to a member function overrideCollectionPermissions() on a non-object on various files then 
[Sat Mar 16 15:42:31 2013] [error] [client 188.127.99.34] PHP Fatal error:  Exception thrown without a stack frame in Unknown on line 0, referer: http://mysite.com/dashboard/system/backup_restore/backup/
[Sat Mar 16 15:42:32 2013] [error] [client 188.127.99.34] PHP Fatal error:  Call to a member function config() on a non-object in /var/www/vhosts/mysite.com/httpdocs/packages/multilingual/helpers/default_language.php on line 55
[Sat Mar 16 15:42:34 2013] [error] [client 188.127.99.34] PHP Fatal error:  Exception thrown without a stack frame in Unknown on line 0


Steps I have taken so far are to:
#repair the db,
#try to merge the older db with the newer one(Too many connections with too many tables to do manually)
#reverted back to our previous versions,
5.6.0.2
5.6.0.1
5.5.2.x (5.6 new permissions lock out the site) I can view a login page but thats all
upgrading to 5.6.1(struggling to force the upgrade)

Any help would really be appreciated I am running out of ideas?
Sean

TheRealSean