Backup strategies

What backup strategy do you use?
 
Examples:
Do you have an external hard drive that you move from computer to computer?
Do you have an extra internal hard drive for each computer?
Do you keep two extra copies of your important files in to physical locations?
Do you use an external RAID so you can either add more storage as needed or redundancy built in?
Do you use a backup service?
 
I have an external hard drive that I move from computer to computer but it no longer holds all my files so I need more space and I am trying to decide which way to go.
 
It seems like no matter how big of a drive you get, it will fill up, especially if you have multiple computers.
 
An external service seems convenient but what if they go out of business? I suppose you could just find a new one and for a short time be exposed.
 
Thanks

Thank you for the reply

With doing local backups, I worry about having enough HD space and keep track of everything. With a cloud service, I worry about them going out of business.
 
I found an online service that is only $29/yr but then how long will they be around?
 
I was thinking at a minimum I would image my drive prior to Windows 10. I have a 500GB drive for data backup now but it is too small for our growing family of computers with photos, music, etc... 
 
I like the idea of getting an external shell, then buying hard drives to put in it. That way you can use RAID configurations.
 
...But then I like the cloud idea for the convenience.
 
Decisions, decisions.
 
Thanks!

I run a nightly job to local NAS.  No compression or anything else.  Just folders and their files so they're readable by any machine without needing to do anything special

These are all good point which is why I am asking.
 
Thanks for all the responses!

Value is in the eye of the beholder.
 
My songs, samples and VSTs are invaluable to me.

After getting those reminder tweets from Craig Anderton every month about backing up, I finally upgraded my system and now have backups.
 
It is not that I did not have backups at all but nothing I could easily restore from should something go wrong.
 
Not that anyone should care but I thought I would post because 1) I am excited about my upgrade and backups; 2) as a reminder that if you are not backing up, you should and 3) SSDs are pretty nice. If you were on the fence, do it!!!
 
I took the opportunity to split my system and data drives, as well as upgrading to an SSD as the system drive.
 
I was concerned about fitting everything on it because I use my computer for everything and have a lot of stuff on it. I purchased a 500GB (the marketing GB) but it really is 465GB formatted. I moved all my data and migrated various program profiles to my new data drive and was able to get my system size down to 122GB of the 465GB SSD. And that is after years of installing, uninstalling, Windows 7 -> 8 -> 8.1 upgrade in place, driver installs, etc...
 
I really should have done this a long time ago. My computer is several years old but it feels like a brand new machine!
 
As far as hardware, I went with a Samsung 500GB SSD and a Western Digital Black 2TB drive for data. I also have a 3TB WD Red to backup my data. I will use an older drive to backup the system drive. I purchased the Acronis software for backing up but I am returning it because of all the negative posts I have read about the latest release. I am not even installing it. I should have read up on it first. lol  I ended up using AOMEI (free) for backup as well as cloning the system. It all went very smooth.
 
The WD Black HDD is soooo fast. I was able to access data quicker on it over USB than from my internal SATA drive (WD Blue). It may have already been dying, I don't know. Once I got everything back up and running, I loaded the Sonar mixing tutorial program and it loads off the new WD Black drive many times faster than it ever did off my old drive.
 
Thank you Craig for the reminders and thank you everyone who posted on the advice and encouragement :-)

Desktop is mirrored RAID.
I back up via Acronis to a Synology NAS (via LAN cable) which is running RAID 5.
I backup the NAS to an external USB hard drive.

(Edited I missed something).