The /data/col1/backup directory is the default destination directory for compressed backup server data. Clients, such as backup servers that perform backup and restore operations with a Data Domain System, at the least, need access to the /data/col1/backup directory.

References:

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DD Replication supports encryption of data-in-flight by using standard Secure Socket Layer (SSL) protocol version 3.

References:

page 11

In many-to-one replication, whether with MTree or directory, replication data flows from several source DD systems to a single destination DD system.

References:

Dell EMC Data Domain Operating System Version 6.1, Administration Guide, page 398