Time Machine to Apple Network Share

Question

I've got a Mac Mini and an iMac on a gigabit network. The Mac Mini has a USB 3.0 HDD attached to it which is the Time Machine backup for the Mac Mini. I've shared it via File Sharing and have access to that HDD on my iMac. I've also set it up as the Time Machine backup location and have successfully started the backup.
I've backed up 500GB at a time many times over Thunderbolt and USB 3.0 and at most, it would take a handful of hours, but not 56 Days. I've let it sit for 3 days now and we're finally down to 49 days...but that's still way too much time for a full gigabit connection with no bottlenecks in my opinion. Any idea as to why this is taking this long? Is there a better way to set this up or accomplish this? Am I missing something? 0.o

Answer 1

If you have more than one user account, these instructions must be carried out as an administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
Make sure the title of the Console window is All Messages. If it isn't, select All Messages from the SYSTEM LOG QUERIES menu on the left. If you don't see that menu, select
View ▹ Show Log List
from the menu bar.
Enter the word "Starting" (without the quotes) in the String Matching text field. You should now see log messages with the words "Starting * backup," where * represents any of the words "automatic," "manual," or "standard." Note the timestamp of the last such message. Clear the text field and scroll back in the log to that time. Select the messages timestamped from then until the end of the backup, or the end of the log if that's not clear. Copy them (command-C) to the Clipboard. Paste (command-V) into a reply to this message.
If there are runs of repeated messages, post only one example of each. Don't post many repetitions of the same message.
When posting a log extract, be selective. Don't post more than is requested.
Please do not indiscriminately dump thousands of lines from the log into this discussion.
Some personal information, such as the names of your files, may be included — anonymize before posting.