This might come handy if you need to copy a database file (Data.fs) from the remote server to your local computer:
scp -C -o CompressionLevel=9 user@yoursite.com:~/plonefolder/zinstance/var/filestorage/Data.fs .
This command line enables real-time compression with the highest compression level. This speeds up copying somewhat, as ZODB database compresses pretty well.
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I recently tried settings CompressionLevel to 9, but debug message always showed a CompressionLevel of 6.
Looking at ‘man ssh_config’ explains:
CompressionLevel
Specifies the compression level to use if compression is enabled. The argument must be an integer from 1 (fast) to 9 (slow, best). The default level is 6, which is
good for most applications. The meaning of the values is the same as in gzip(1). Note that this option applies to protocol version 1 only.
Nevertheless a good hint to use compression if you copy a ZODB with scp.