barely have 15M service
Then drop a flash drive or external HDD at a friend’s place, a relative’s place or a drawer at your workplace. A remote backup doesn’t have to be done over the internet, it just has to be somewhere other than your house (or wherever the machine you’re backing up is).
and few would have 3 or 4 computers laying about
Then buy an external HDD instead. It costs $60 to buy a 2TB HDD from Amazon. That’s likely big enough to back up every computer in your house.
Hell, if the amount of important data you have is small, buy a spindle of Blu-Rays. You can get a spindle of 25 25GB BD-R’s for about $10.
The real point is that we depend on these backup services to do what they say they’ll do. We pay them to ensure that the backups are reliable.
If you’re relying on these services alone, I think you misunderstand what it is you’re paying for. You’re not paying them to ensure that backups are reliable, you’re paying them to store your data and return it to you on a best-effort basis. They offer no guarantees and accept no liability. If they fail you, your recourse is at best a refund. If all your data is lost, you’re entitled to maybe a couple hundred in compensation. Is that enough to make up for the loss of your data?
Don’t believe me? Look at the terms. What happens when they lose all your data? Spoiler: nothing. Even if you get lawyers involved, the terms remove all liability. “But what about their reputation!?” you say? Have a Google around. These companies have failed people in the past. They’re still afloat.
Plus, if your internet is as slow as you say, it’s going to take days to weeks to restore your backup if something goes wrong. You can’t even properly test it.
An untested strategy isn’t a backup strategy at all. You have no idea if the restore will work. You’re essentially just praying that everything goes as you expect it to.
A service like Backblaze can absolutely be part of a backup strategy but it’s definitely not a backup strategy on its own, especially if you’re not in a position to restore the backup.
That’s about all we can do in our real world.
For the price of a year of Backblaze, you can buy a 2TB external HDD from Amazon, likely more than enough to back up all your computers.
Buy two of them. Keep one at home and back up to it with backup software (which your computer likely has built-in) every few weeks. Leave another one with a friend or one of the other places I listed. Swap the two HDDs every few weeks/months.
You can even test the backup. Find a technical friend with a spare hard drive (or buy one, again, less than $100, you can use it as a third backup drive), swap it for the one in the computer you’re backing up and try restoring to it.
Also a big plus: these backups are fast and close. If your house burns down, all you have to do is go to your friend/relative/workplace and pick up the HDD. You have all your data mere minutes/hours after your main computer was destroyed.
There’s a lot more you can do than just pray that Backblaze will work.