BACK Up sequencing – any comments or advice?

Our schedule, any comments?
we have been doing this…

1st back up full (anyday)
mon-thu differential
fri full
Month end full (last friday of the month)

We have 2 sets mon-fri tapes, 1 for odd month and the other for even month.

As for month end, we retain 12 tapes (one for each month).

Any comments on this? Please share your experience and advice what I can do to improve..thanks in advance.