app-backup/tarsnap
Online backups for the truly paranoid
USE Flags
acl
Global: Adds support for Access Control Lists
bzip2
Global: Use the bzlib compression library
lzma
Global: Allow accessing lzma-compressed archives through the lzma library (app-arch/xz-utils). This only affects libarchive's native support: bsdtar will keep using unlzma as a filter if that's not built-in.
xattr
Global: Adds support for extended attributes (filesystem-stored metadata)