I remember seeing a highly upvoted answer here stating that sometimes the server log files "fail to decompress" when using the highest compression level in 7-Zip.
Can this happen if 7-Zip doesn't give any errors during the compression phase?
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user198350
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I could find nothing on the web related to 7-Zip's ultra compression being buggy.
If a 7-Zip archive cannot be extracted, it would most likely be due to file corruption after the archive was created.
However, if an archived data is important, you should always test decompression before deleting the originals.
Keltari
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