On the other hand, it is important to note, that tar does not save the filesystem encoding, which means that tar compressed filenames can become unreadable if decompressed on a different computer. But it is worth noting that GNU tar (common in many UNIX environments) can also compress with the LZMA algorithm natively, without the use of 7z, and that in this case the suggested file extension for the archive is '.tar.lzma' (or just '.tlz'), and not '.tar.7z'. A workaround on UNIX-like systems for this is to convert data to a before compressing with 7z.
Limitations The 7z format does not store (such as owner/group permissions or ), and hence can be inappropriate for backup/archival purposes. The 7z format provides the option to encrypt the filenames of a 7z archive. Current GPU-based, and custom hardware attacks limit the effectiveness of this particular method of key stretching, so it is still important to choose a strong password.
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