Two is one, one is none philosophy

[PETE]

My buddy lives by this. He has two of everything. I thought it was overkill until my only shotgun broke during hunting season and now I get it

 

[HighRanks]

That lesson hurts once, after that, backups suddenly seem very reasonable.

 

[BKLooney]

I've always adhered to this philosophy...sometimes the backup doesn't get used, but it's there waiting to step in and do its job.

 

[MC2]

No plan survives first contact; contingencies are a must.