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Don't forget to copy your files with their (extended) attributes, and make sure the fs you're backing up to supports the attributes of your current one.
Arch Linux ARM uses bsdtar; there may be a reason for this (xattr related; different formats perhaps). In any case though I don't think you'll mess up your system too badly if you forget xattrs, as long as you're not using SELinux or PaX. A couple binaries might lose capabilities
