My Time Capsule (1rst Gen 2008, 500 Go) takes 10 mn every hour to backup, even if only 10Mb to backup.
It's connected through Ethernet, so it is not a network problem, but it seems to be indexing for ever (I hear the disk turning)
What to do ?
In fact, I already had the power supply problem and the model was changed once already by Apple. This the replacement Time Capsule.
There is still 56 GB left, so this should not be the problem.
I went to http://pondini.org/TM/D2.html and erased the spotlight index.
Now it's much faster (4-5 mn).
I still have a strange error:
I'll put it in a separate message, for clarity