Leopard Server Time Machine Questions

We've been running Time Machine to backup client data for about 20 users for a number of months. We've set this up with Time Machine saving to a 750GB RAID 1 external drive mounted as a share point. Each user has a maximum disk quota on the share point (set up using 'edquota'). We now have some questions about how Time Machine is supposed to work:
1) We're starting to get errors that Time Machine has run out of space for individual users. We understood that Time Machine would simply delete the oldest backups and then continue (as it does with standard Time Machine on an individual Mac) but this doesn't seem to happen. Instead we get a warning that there isn't enough space. Is this correct for Server-based Time Machine or is there something we can/should do to make Time Machine behave 'normally' and auto-delete oldest backups to make space for new backups?
2) We've used 'edquota', 'quotacheck' and 'repquota' commands to create our user quotas on a share point. However we can't find any way of removing an individual user's quota completely - it seems we can change their quota but we can't remove them and start again without removing the user completely from the server. Is there any way of resetting and/or removing a user's disk quota on a share point, including clearing down all their data? For example, we have one user that has 3GB of 10GB quota 'in use' even when all their data has been removed manually. There are no hidden folders/files etc. but 'quotacheck says they are still using 3GB!
3) We have an HP Ultrium 960 LTO-3 SCSI tape drive. Does anyone know how we can backup our Time Machine data onto these tapes for off-site archives? We've looked at EMC Retrospect 8.1 but this doesn't seem to work properly with Time Machine data (and seems to be generally flakey!). Does anyone know of general OS X/Unix drivers for this type of device that would allow us to use Unix commands ('tar' etc.). Alternatively can anyone recommend a backup software solution that actually works with Time Machine data?
4) Can anyone recommend a known working solution to keeping long term archives of Time Machine data?
Thanks for any help!

Thanks for a quick response!
We only backup selected client data, excluding system, apps, music, photos etc. i.e. only company data not personal data or general system data (our client systems are built from a common standard build brick). So 10GB-25GB is fine for many months of Time Machine backups for our user population.
We like Time Machine because the user doesn't have to do anything for backing up, it works automatically and the user can recover their 'oops' files without tech support help. So we're keen to get the benefits of Time Machine for several months of immediate backups that users can deal with themselves, but also we'd like some kind of longer term off-site archive capability - this is why we'd like to tape the Time Machine data.
We don't have a working tape solution at present. We have an old Retrospect 6 licence which explicitly does nothing (but complain!) with Time Machine data. We tried a trial licence of Retrospect 8.1 but it seems flakey in general and did not cope reliably with Time Machine data. We wondered about Bru but we'd have to remove Retrospect 6 (which we're keeping in case we need to recover from old archive tapes).
Currently our server is backed up using a combination of techniques:
1) Time Machine of the server itself (system and data)
2) Time Machine of the company data share point onto an external 750GB RAID 1 drive (2 active disks mirrored + 1 spare disk)
3) Weekly 'breaking' of RAID 1 mirror using a spare drive (i.e. weekly rotation of mirror drive)
4) Weekly clones of server system material (but not data) onto FireWire external drive
5) Monthly clone of RAID 1 onto another external FireWire drive (we intend to rotate this with another identical drive)
Can you confirm the situation regarding Time Machine when it runs out of space - how do we get it to 'roll over' old backup data?
Thanks again

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