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April 02, 2013, 08:01:02 AM |
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There is multi-part file for RAR files. Also parity files. And QuickPar. Although those are all old, but if you had burned a CD or DVD 8 years ago, and it has actually oxidized partially, there is a possibility to recover enough of the files and the parity files to reconstruct the original file.
I see that there is now something called MultiPar. When a future damage is predictable, you can prepare for it.
Currently, what I use is just RAR. I use recovery record and passwords. You can opt not to use compression too.
On burning to optical media or saving to USB flash drives, I make multiple copies of the same file, since the RAR'd wallet file is generally less than 1 megabyte and the capacity of the CD or DVD is many hundreds of times.
Then of course, there are paper backups. The encryption of QR codes is not yet standardized and every other QR code software seems to have their own version.
You could just ASCII armor the RAR file, and print that (either as text or as a giant QR code). That way, it is encrypted, it is in paper, and you can make multiple copies of it.
Your problems disappear: 1. Cracking your encryption = use long passwords = end of time before the cracker cracks your backup. 2. Multiple copies in different locations = you don't lose all your coins. 3. Each backup copy is encrypted = same risk of being stolen as getting access to only one backup copy.
Software pirates used to upload on USENET, and upload 10 parts of RAR files, with 3 or 4 recovery files. So if 3 files out of the 10 are corrupted, you can still recover the whole thing.
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