Backups in SQL Anywhere are basically a 'page for page' backup.
No extra encryption or compression is performed.
If the source database is already encrypted then the database file pages
will be encrypted 'over the wire' and at the destination; and no decryption
is performed at any point during the backup.
For transaction logs, unused pages at the end of the file will not be copied
so the destination copy can be smaller by that amount. For database files,
depending upon the nature of the backup, checkpoint log pages might also be eliminated;
depending upon which 'WITH CHECKPOINT LOG' option you choose (if any).
But neither of those are compression, in the normal meaning of that word even
the the end result may be a bit smaller.
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