Patch for enabling xz compression.
Patch for enabling xz compression and set compression ratio
+ Control if $BACKUPDIR doesn't exist
Unless you can give me a really good reason as to why xz and arc compression is necessary, I won't include it in the program. Gzip and Bzip2 are the most common compressions and should suffice.
For several years now xz is a standard compression tool delivered as core utility at every major linux distribution. The compression ratio is about 10%-50% better than bzip2. That's why I prefer xz very often.
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