Have to laugh at myself... not uncommon.
I use an app called GoodSync to backup my data and media drives to other systems. What I like is that it has, both, sync and backup modes. I use the backup mode as I want everything to be exactly as it is on my main system. I also like that I can exclude items from the backup. For instance, my Mac Book and Surface do not have enough space on the data drives to fit everything from my main so I exclude items, such as my Steam Library, from the backup. I find the app pretty awesome.
So, anyway, I was trying to backup my main's second media drive to my other desktop that gets a full copy of everything. Problem was that I just plain could not connect to the second desktop. I tried and tried with no joy. Then my second of my two remaining brain cells came out of its normal comatose state and remembered that I re-started the second system this morning but had not yet logged in. Amazing that all was fine after the log in.
If you are interested in a really good sync app you should take a peek at GoodSync. Oh, you can also sync to their cloud but I don't as I don't like cloud storage and you have to pay for cloud storage
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www.goodsync.com