Old Time Machine Back-Ups on new iMac

Hey Everyone..
So I got myself a new iMac today and I'm really pleased with it. I went for the 3.1GHz i5 in place of my old 2.8GHz i7.
Anyways - I restored the new machine from the most recent back up of my old iMac which has worked great and looks just like my previous computer. However..when I enter Time Machine it only goes back as far as today and when I try to do a back up it says there is not enough room. I would have hoped that my new iMac would recognise the back up as it's own and reinstate it as normal..but this doesn't seem to be the case.
If someone could give me some guidance on this I would appreciate it.
Many thanks..
Ricky

Time Machine will always treat a new computer's data as a completely new backup and start it from scratch. You can either get a larger backup drive or erase the current one.
About TM "Backup Drive is Full"
Alert TM only deletes older files if they have been deleted from the source and when TM needs space on the backup drive for a new incremental backup. Time Machine "thins" it's backups; hourly backups over 24 hours old, except the first of the day; those "daily" backups over 30 days old, except the first of the week. The weeklies are kept as long as there's room.
So, how long a backup file remains depends on how long it was on your Mac before being deleted, assuming you do at least one backup per day. If it was there for at least 24 hours, it will be kept for at least a month. If it was there for at least a week, it will be kept as long as there's room.
Note, that on a Time Capsule the sparsebundle grows in size as needed, but doesn't shrink. Thus, from the user's view of the TC it appears that no space has been freed, although there may be space in the sparsebundle.
Once TM has found it cannot free up enough space for a new backup it reports the disk is full. You can either erase the backup drive and start your backups anew or replace the drive with a larger drive.

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