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I had the problem that the contacts in the Address Book app were not syncing probably with my business Exchange account. Here is how I fixed it:

1. Close contacts app
2. Remove all iCloud and Exchange accounts in System Preferences > Internet Accounts
3. Remove everything in ~/Application Support/AddressBook
4. Add Exchange and iCloud Accounts again in System Preferences > Internet Accounts

Mounting shares on my Synology NAS via AFP was very unstable and sometimes shares were disconnected for no real reason, so I finally decided to move to SMB. AFP is deprecated anyway and even Apple suggests to move to SMB. While I usually had 100MB/s transfer speeds on AFP, I only got around 30MB/s on SMB. So after some research I found the following solution:

1. Set SMB version to SMB V3 on the Synology (File Services > Windows > Advanced)
2. Disable “SMB Signing” on your Mac clients by creating /etc/nsmb.conf:

#> sudo vi /etc/nsmb.conf
[default]
signing_required=no

If you try to download a video from Facebook to your local hard drive, you will realise, that you can’t just right-click on it as you would do with videos on other sites or images. However, there is an easy and free way of saving a local copy of that video:

1. Find the URL to the single post. The easiest way is to right-click on the timestamp close to the top left corner. It says how many minutes, hours or days the video was posted and copy the link to your clipboard.
2. Past the URL into a new browser window or tab, but do not press Enter, e.g.; https://www.facebook.com/spiegelonline/videos/10154407205429869/
3. Change the “www” in the URL to “m”, e.g.: https://m.facebook.com/spiegelonline/videos/10154407205429869/ and press Enter so that you get to the mobile version of this Facebook post
4. Click play on the video
5. Right-click “Save as” on the video.
6. Done