Story:
For some years, I've needed to start "spring-clean" on my storages. Had bought more usb hubs and adapters and extension cords etc.
Checking disks and thinkin how to organise the archives again, I notice that a "local backup" of an off-site raid-5-nas has problems.
Digging deeper, I found out that in Feb 2018 I had used it to transfer stuff from one disk to another. I did it with old mbp and started with usb3-expresscard, which prooved to be fleaky, so I copied everything again with usb2 (the other drive was connected with fw800).
Archive that was copied was 2.7TB of tv-recordings that were not important and I had no time to verify the copy.
Now I found out that these files have been mixed with my archive of family videos!
Opening up my mom's funeral or sister's wedding opens up some random tv program!
Of course I have prepared for disasters, so I ask my dad to switch on my "off-site-nas" at his house, since I can't get it on remotely. He tells me: "It does not turn on." OMG. And I just wrote everything I had on-site to that problem disk.
In parallel reality we could use optical WORM disks, that would now be cheap and something like one or half a terabyte. I'd wish to be in that reality. In our reality, I don't think we have any other econimical option to archive our personal digital life than hdd's.
But since I'm here (in our reality), I'd like to hear experiences and ideas on how to monitor and preserve data integrity in "advanced home enviroment".
What would be the best software for this?
Or just brute force? Meaning multiple computers dedicated to making multiple clones of everything and verifying that files that were not touched haven't been corrupted.
(My biggest problem has always been that I need to do something else with that computer doing the copying. Which always takes too many hours. In this case changing from usb3 to usb2 extended the copy time from 5 hours to 50 hours. Then there would be additional 50 hours for verify...)
How often this (copying stuff corrupts other stuff in the same disk) can happen?
I understans some of filesystem basics. This problem could happen just because of corrupted file allocation table where data is pointed to be in a wrong place. And of course, hpf+ does not verify the copying process. Is there a terminal command that does verify? Ditto?
For some years, I've needed to start "spring-clean" on my storages. Had bought more usb hubs and adapters and extension cords etc.
Checking disks and thinkin how to organise the archives again, I notice that a "local backup" of an off-site raid-5-nas has problems.
Digging deeper, I found out that in Feb 2018 I had used it to transfer stuff from one disk to another. I did it with old mbp and started with usb3-expresscard, which prooved to be fleaky, so I copied everything again with usb2 (the other drive was connected with fw800).
Archive that was copied was 2.7TB of tv-recordings that were not important and I had no time to verify the copy.
Now I found out that these files have been mixed with my archive of family videos!
Opening up my mom's funeral or sister's wedding opens up some random tv program!
Of course I have prepared for disasters, so I ask my dad to switch on my "off-site-nas" at his house, since I can't get it on remotely. He tells me: "It does not turn on." OMG. And I just wrote everything I had on-site to that problem disk.
In parallel reality we could use optical WORM disks, that would now be cheap and something like one or half a terabyte. I'd wish to be in that reality. In our reality, I don't think we have any other econimical option to archive our personal digital life than hdd's.
But since I'm here (in our reality), I'd like to hear experiences and ideas on how to monitor and preserve data integrity in "advanced home enviroment".
What would be the best software for this?
Or just brute force? Meaning multiple computers dedicated to making multiple clones of everything and verifying that files that were not touched haven't been corrupted.
(My biggest problem has always been that I need to do something else with that computer doing the copying. Which always takes too many hours. In this case changing from usb3 to usb2 extended the copy time from 5 hours to 50 hours. Then there would be additional 50 hours for verify...)
How often this (copying stuff corrupts other stuff in the same disk) can happen?
I understans some of filesystem basics. This problem could happen just because of corrupted file allocation table where data is pointed to be in a wrong place. And of course, hpf+ does not verify the copying process. Is there a terminal command that does verify? Ditto?