Got to the point where Spreadsheets only matter to the Tax Man. 
I try to keep things in order by date. Images, documents each month. I transferred it to DVD but now I have a Terabyte. It’s vast. I actually have five but the supplier incorrectly supplied the others.
Baz, you can store your data on a cloud platform.
That error was a costly one by the supplier if you didn’t have to return them, good for you though.
No shortage of storage now that’s for sure! 
Yes, I do that Minx. Having four Macs, well one of them is an iPhone, I have four lots of free storage on iCloud. The most useful storage I find is using Time Machine, that is a free application with Macs and backs up to anything you choose automatically, I don’t have to do anything at all. I use an external hard drive for that, it backs up only files that have been changed and when full the older files just ‘fall off’ the end. Now no longer working that is enough for me. Working as a graphic designer in the past there was a real need to ensure everything was backed up, that was all income so very important, not so much these days though.
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2 Windows 10 Desktop PCs - each OS backed up daily (1 incremental/1 differential) to its own EHD with a month of copies retained - Macrium Reflect
All personal data held on another EHD for each PC - most, including my MP3 collection, held in OneDrive (1TB), and therefore, when updated, instantaneously backed up to the cloud and the alternate PC/EHD - the rest, mostly large video files, are rarely updated but are manually copied to the alternate PC/EHD when required.
Additionally, for each PC, a full Windows system image weekly with daily HDD file backups to EHD.
ETA Also Google Drive (15GB) on both PC/EHDs to interface with my mobile phone.
Multi-generational system and data backups with off-site storage and remote recovery facilities were entirely familiar to a mainframe computer specialist like myself … and I never lost the habit … 
IIRC, Grandfather was kept in a fireproof safe in a remote location onsite, Father was kept in a fireproof safe in the building housing the mainframe computer and Son was located either in the racks or on a trolley, ready to be ‘cycled’.
The IBM 2311 Disk Drive and 2400 Tape Drive
I could if I knew how…but the tetrabytes do vastly more than I need and I can plug them anywhere on our computers.
I have a 2tb external HD partitioned into 2 1xtb sections permanently connected to the PC, for storage, a further 4tb drive as a backup for everything and also spreadsheets saved to my OneDrive. Files are auto backed up every night to one of the external partitions and in turn, those partitions incrementally backed up to the 4tb drive.
I back my data up to two NAS drives as well as a variety of USB HDDs. The NAS drives have redundancy built in via RAID Arrays so if one drive fails data is not lost.
NAS = Network Attached Storage
This is one I have it is a few years old now
Its interface looks like this (there is 3.78Tb free)
Wow, there are only experts on board. I have my data on two external HDDs only, nothing stored on the notebook itself nor on the cloud which I could use but do not really trust. Not sure which of my data are really worth saving. Those that are would go on a memory stick I guess. I’ll take this as an opportunity to think about it again.
I don’t seem to be as well-organised as I want to think I am.
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I use flash drives, CDs, an external HD and good old fashioned printed hard copy for some things - would not trust the ‘cloud’ as far as I could throw an elephant!
You can have your own “cloud”, don’t you trust yourself?
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Accidental Post
All my data is first backed-up to a cloud service.
In addition I back up to a NAS and them manually at least weekly to a portable drive.
Of course I trust me - I just don’t don’t trust clouds - they rain on people!
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I have never stored anything other than software on my computers. All files, photos, etc are stored on USB sticks.
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Before I had my notebook repaired once (new keyboard) I had cleaned the hard disc because I suspected they might have a look at its content. On picking up the notebook it turned out he had at least noticed that it was empty and you never know if they wouldn’t have felt tempted to take a closer look if it wasn’t.
I back up to two external hard drives every month or so, or whenever the urge takes me. I keep one in our safe and the other in my ‘toy cupboard’.
I use Backup/File History for one of them but, for some reason, Windows won’t let me use that for the other one as well (?) so I use FreeFileSync for that. They both work very well.
In the interim, I back up individual files, pictures, etc. to One Drive. I used to do the same to Dropbox as well, but they recently changed their appearance and made it a bit more fiddly, so I don’t use that any more, and try to remember to back up to the hard drives more frequently instead.
Inspirational photographer was once asked:
Q. what is your best photo?
A. I haven’t taken it yet.
That’s attitude. 
I have nothing but photos by the thousands, they’re in the clouds, best place for them. They are better organised up there, easier to find. I can email and/or post links to pics & albums …
What’s on my pc is worse case scenario back up.
The link below was found on my desktop courtesy of Siri, usually I have seen whatever is found by this intelligent Apple application but not this time. The article is about cloud storage, anyone who is interested in knowing what cloud storage actually is might find this a good read: