I've finished compressing the autoburt snapshots. This has reduced the space utilization on /ligo from a high of 81% down to 48%. The rough compression ratio was about 10:1. In each burt year directory with compressed archives there is now a CHECKSUMS.MD5 file with the md5 checksum of each archive which may be used to verify the integrity of the archive if needed. Rsync backups of /ligo should now be somewhat more efficient as well with fewer files to compare looking for changes.