Been away for 4 months- just come back and time machine wont back up

Ive just been traveling for 4 months and left my 1TB Time Machine @ home.
I just came back - plugged it in so that time machine could do a back up but, it says it can't, because it has been over 127 days - or something like that.
Now it says it need 521GB
My last backup was 458GB - only 63GB DIFFERENCE
It seems that it is now trying to write a whole new backup instead of adding to my previous ones.
Also I can't enter time machine and browse my old backups.
Please I don't want to have this problem every time i get home- why can;t i just plug it in and backup?

Beetlejuice07 wrote:
Ive just been traveling for 4 months and left my 1TB Time Machine @ home.
I just came back - plugged it in so that time machine could do a back up but, it says it can't, because it has been over 127 days - or something like that.
Now it says it need 521GB
My last backup was 458GB - only 63GB DIFFERENCE
It seems that it is now trying to write a whole new backup instead of adding to my previous ones.
Yes, that can happen. See #D3 in the Time Machine - Troubleshooting *User Tip* at the top of this forum.
Also I can't enter time machine and browse my old backups.
Most likely, TM deleted all but your most recent backup trying to make room for the new full one. But if you see no backups at all, try the Browse option in #E2 of the same Tip.

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