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Can a backup created on a 32bit installation be restored onto a 64bit system after upgrade?

I'm using Deja Dup as a backup with the default settings (basically the Home folder). I don't have any "special" folders but would like to maintain the email history and settings (Thunderbird).

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What sort of backup? Are you cloning the entire system, or just backing up your files? 32Bit 'clone' should work on 64bit architecture, but not visa versa –  cosmorogers Jan 15 '12 at 19:49
    
I'm using Deja Dup as a backup with the default settings (basically the Home folder). I don't have any "special" folders but would like to maintain the email history and settings (Thunderbird). –  John Belton Jan 15 '12 at 19:56
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That depends on what you have to backed up. Anything that is just data, i.e. music, pictures, textfiles (configuration files) and movies can be restored without a problem. Executables (anything in /bin /sbin /usr/bin /usr/sbin and some other places) are not usable from a backup in general. This shouldn't pose a problem, though because the programs you have installed can simply be installed again.

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Thanks for that info, I am going to give it a try soon, I have tried Ubuntu 11.10 64bit version using Wubi in the Windows Partition on my laptop and it works but wanted to up the RAM to 4GiB and I was concerned it might be too much hassle to do the whole job and replace the 32bit version I normally use. –  John Belton Jan 16 '12 at 11:48
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