How come that the time machine backup takes 5 days to sync 200 GB over the ethernet?

I'm really not happy with the backup speed of the time machine. it has been 1 day and half that it is syncing and for now just 36GB are done of 210GB.

The remaining time estimation is ridiculous around 5 more days?😢

How come this is possible?? I cannot move my mac pro anywhere else it needs to be plug-in 24/7 to the Ethernet and power, of course hoping that everything goes already during these 5 days to backup.

I've tried different things, I've check my disk for issues also for permission issues none existed.

I've tried to restart the backup from scratch, even some times it start fast it slows down to a very low transfer rate, and now the current rate of transfer is around 1KB or lower :S

The soul purpose of the time capsule is to do backups but at this speed rate it's useless, and from what I saw it happens to other people.

I must have being doing something very wrong, can anyone help me or give me suggestions?😕

Regards

P.S. Mac pro 13'' early 2011 with 8 GB, Mac OX 10.7.5