deleting backups with db2adutl and meaning of keep parameter

[db2admin]

hello,

we take full on sunday and incremental delta rest of the days
everyday.

i want to keep only 8 weeks of backups on TSM. i am trying to
understand the meaning of parameter "keep" in db2adutl command. if you
say keep 64 which means 64 backups, will it try to keep 64 of full and
64 of incremental delta's ? if that is true, it will keep 64 weeks of
full backups ( because we only take full backup once a week ) and keep
little more than 10 weeks of incremental delta's ( because we take
delta's everyday except sunday's )

please share your thoughts and let me know how should i do this.

regards,
db2admin