Read Only TBS Backup Confirmation

[Gene Sais]

ENV: - AIX 4.3.3 - Oracle 8.1.7 I have one tablespace which is read only.  Can I just copy the datafiles from a Read Only tablespace for a valid backup?  For the rest of the db, I backup hot or cold.    Is anyone copying Read Only Tablespace datafiles for backups?  I haven't found this method officially supported by Oracle, but have read that is safe to copy Read Only datafiles (makes sense), just wondering if anyone is doing it?   Thanks, Gene