Yeah. P2ppol is PPLNS which would brutally punish you for leaving during a block (much like Bitminter).


Backup pool is likely to be rarely uses so it should be a PPS or SMPPS or ESMPPS.  You could also use Prop pool but given the income you lose to intentional hoppers and the fact there are lots of good PPS based pools I wouldn't.  Score based and PPLNS would be the worst if you will be using them for variable amounts of time.

On edit:  I have since learned this is incorrect.  Using PPLNS intermittently will not reduce your expected reward it does however have variability so it you use it infrequently and for short periods of time the payout can vary significantly (form significantly greater than expected value to significantly less or nothing).