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Rar Compression is much more efficient in terms of processor usage, memory usage compared to 7z's LZMA / LZMA2 and also good for recovering from damaged archives. My experience is in using Rar compression for data backups of terabytes of data on a weekly basis for the last couple of years, mostly in semi automated manner. Though I get very rare requests for data restores (restoring backed up data from Rar archives), some times I have faced corrupt Rar archives which were repaired with very minimal data loss. 7z was tried parallely, but was abandoned due to too much cpu / mem usage.
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