Holger writes:

> 1.) Full backups go to more trouble to determine which files have changed and
>     which haven't.
>     tar/smb:  all files are transfered, BackupPC checks (full) vs.
>               only newer files (based on timestamp) transfered (incremental)
>     rsync(d): block checksum comparison (full) vs.
>               timestamp/size comparison (incremental)

One slight clarfication: rsync(d) incrementals are based on any
attribute change (mtime, size, uid, gid, type, mode) and it also
detects whether the file is deleted or newly appeared.  Tar/smb
incrementals don't detect deleted files, nor new files that have
old timestamps (eg: from a rename or archive unpack).

Craig

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