If you are new to DB2 and not comfortable with DB2 backup/restores, I would not suggest using BACKUP TABLESPACE ..
There are many restrictions on resotring a tablespace ... the ones that I can think of right now are :
1) You cannot restore the tablespace backup toi another database
2) You cannot use this backup to recover a dropped table
Our database is in archive mode and we have altogether 10 tablespaces in different filesystems and iam confortable with all the backups and restores.
Just wanted to know something about schema level backups...