Time Machine is macOS’s built-in backup tool that automatically saves copies of your files, apps, and system settings. It allows you to restore lost files or roll back your Mac to a previous state. 9 out of 10 times this works smoothly with key features listed below when it works its brilliant. However the 10th time it not working you have to go through a sequence to trouble shoot why its not backing up.
Key Features of Time Machine
✅ Automatic Backups – Backs up your Mac hourly (last 24 hours), daily (last month), and weekly (older backups).
✅ Incremental Backups – Saves only new or changed files, not everything every time.
✅ Easy File Recovery – Lets you restore individual files or your entire system.
✅ Mac Migration – Use it to transfer your data to a new Mac.
✅ Works with External & Network Drives – Supports USB, Thunderbolt, NAS, and Time Capsule.
The Magic Keyboard and Magic Mouse 2 have been out since Oct 2015 replacing the similar designed mouse and a more flatter triangle shaped design keyboard with a rechargeable battery instead of the AA batteries. In theory gone now are the days of having a issue with a keyboard or mouse losing connection to the mac. Now you just plug in the lighting cable and away you go, well the keyboard anyhow, the mouse is a bit difficult to work with while its plugged in for regarding. 
The machines talk to each other and less than a minute the printer is now on the network.
This question has been around for a number of years. There are lots of remote programs out there here are the top few I find work very nice with your mac.
Recently came across an issue registering a Apple TV 3 inside a sky broadband network. Seems one of the ports is not open thus allowing the Apple device register over the internet. This issue materialised in the last few weeks with a number of clients with their new Apple TV.