Daily backup doing a full backup when scheduled for a partial

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Hi Everyone,

Our backups failed at the weekend and as a result the dailys are now doing a weekly and taking up to 7 hours whereas before they only took an hour to complete.

I was hoping once the first incorrect weekly took place on monday it would revert to the regular daily but to no avail.

Does anyone have any ideas? I have checked the properties of daily and weekly and nothing has changed.

Thanks for the help
Declan