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Standardizing Across Operating Systems - Moving files with ACLs between operating systems that both support ACLs may not work.
Copying Files - Even though you set This is no-longer an issue with modern (2012 is when I checked) versions of Ubuntu and I would guess other *nix systems. With an older system, check that when setting default ACLs on a directory so new files created will inherent permissions, the copy command will ignore this, the following commands will inherit permissions properly: local copy, sftp remote create and sftp remote copy.
ACLs and Groups
The most scalable way to use ACLs is to apply groups. A tutorial approach will be used to illustrate the commands.
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