Time Machine back up failed

i have a 1tb time capsule and since activating iCloud my back up fails, insufficent disc space, however I have only used 653GB on my iMAC HD, any suggestions welcome

When it says failed, there should be a small letter 'i' in red. Click on it and it will give you the "reason" for the failure. I quoted the word reason as it may be a fairly generic not overly specific reason, but it is a start.
Also the system.log in Console may give more information.
There are lots of entries in the log from many applications interspersed, but most of the Time machine backup ones have 'backupdb' in them. There from the backup daemon which is the workhorse of the actual backups.
Let us know what you find.

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